Every year for Halloween my kids get a "ride" that is themed with their costumes. We did scooby and Fred in the Mystery Machine, Buzz and the alien in the spaceship, and cop and prisoner in cop car. This year we decided on Adventure Time. It started out as just costumes and a Lady Rainacorn ride for the boys but evloved from there. Now we have a group of people all dressing up as characters and an elaborate rainacorn set up.

I started on making the costumes before I found out that you can buy them at Spirit Halloween, but even so, I like these designs much better than the store bought ones.

For the costumes you will need various items according to the ones you are making, including but not limited to:
fabric
scissors
needle and thread
measuring tape
sewing pins
stuffing

For Lady Rainacorn (build) you will need:
cardboard
exacto knife
scissors
measuring tape
hot glue gun and glue sticks
pencil
sharpie
painting supplies
reference pictures
fabric
2 wagons
metal clips or rope or zipties

Lady Rainacorn (poop machine) you will need:

Remote control car and controller
2 cardboard spools (i think used to hold ribbon)
Nylon webbing (like on back pack straps)
needle and thread
Unicorn poop cookies (materials needed are in that instructable)
plastic wrap
cardboard
hot glue gun and glue sticks
scissors/ box cutter
duck tape
extra hands

For the Extra stuff ( bags and Music videos) you'll need:
MP3 player
file converting software ( I used 123 DVD)
small but loud speaker
halloween bags
paint and brushes
pencil
reference photos

Step 1: Costumes

This instructable pulls from several other instructables.

Jake's costume was made by following this instuctable:

https://www.instructables.com/id/Adventure-Time-Make-Jake/

Finn's costume was made by following this one for the backpack:

https://www.instructables.com/id/Adventure-Time-Finn-costume-Backpack-functional/
and this one for the hat:

https://www.instructables.com/id/Adventure-Time-Finns-Hat-Pattern/

Finn's Sword can be bought at Spirit Halloween for $10 but I bought a plastic sword from the dollar tree and painted it to look like Finn's..much cheaper.

Fiona's costume was made the same way as Finn's but her ears are longer. I inserted cardboard in the ears to help them stand a little better.

Ice King can be made by following this instructable:
https://www.instructables.com/id/Ice-King-Costume/

Princess Bubblegum was store bought
note: the wig wasnt working for her so the second time around, she use pink hair color spray instead, and the crown wouldnt stand up right so we backed it with cardboard.

Marceline was put t ogether using regular clothes, black hair color spray, and red face paint for the vampire bite.

Marceline's Ax shaped guitar was made by drawing it out on cardboard, cut it out twice, glue the two pieces together for more stability, and paint it.
note: the second time out, we added a strap so she didnt have to hold it all night.

Step 2: Lady Rainacorn Build: Side Panels

Lady Rainacorn was built using cardboard and hot glue over 2 wagons tied together with some fabric for the tail and mane.

1. Measure your wagons. How long are both together when tied? how long is each one? The height from top of wheels to top of side. The width from side the side. The length of the side of the interior.

2. Get lots of cardboard.

3. You need to make the side panels. You will need 4 of them; one for each side of each wagon. They need to be the length of the wagon plus a little more past the end in the front and past the back halfway to the front the second wagon. The height needs to be as such that it doesnt go past the wheels. Find out how long this will be and get a box that is this length and cut one edge so that it is one long peice folded in half. If you dont have a box big enough, you can take smaller boxes, cut one edge of each one, line them up to the correct lenght and hot glue them all together on each side. See images 3 and 4.

4. now we need to cut a flap in one side of the side panel to the size of the interior length of the wagon so that the flap will insert into the wagon and the other side of the panel will hang on the outside of the wagon. Measure this length either by meauring tape or by holding your panel to the side of the wagon and marking the measurement on it. The flap needs to be placed so that the panel extends a little past the front and the rest past the back. See images 5 through 8

5. Do the same thing for the other side of the front wagon.

6. The side panels for the back wagon are done the same way except that the panels will extend only a little from the back and the rest from the front.

Step 3: Lady Rainacorn Build: Front and Rear Panels With Legs

Now we need to make the front and back panels.

1. Cut a peice of cardboard to the size of the front on the front wagon and a second peice to the size of the back of the back wagon.

2. Decide how long you want your legs to be and cut a strip of cardboard to that length. Cut it wider than you think you will need because you can trim it later.

3. Bend the cardboard so that it will wrap around into itself to make a cylinder. Hot glue the edge and cut off the excess.

4. Cut a small circle from coardboard to fit over the opening of the cylinder and hot glue the circle in place. Then trim the excess of the circle.

5. Repeat these steps 3 more times so you have 4 legs.

6. Line up the placement of the legs on the panels and hot glue in place.

Step 4: Lady Rainacorn Build: Head and Neck

Now to build the head. I debated the material to use. I was considering paper mache, plaster strips over tin foil, and chicken wire and tissue paper. I decided to just do it in cardboard. Making rounded things is not my forte in cardboard but I'm happy enough with it.

First, I drew out the profile view of the head on cardboard and cut out two copies. Then I cut a slit up one copy from the nose to a little bit away from the back and cut a slit in the other copy in the reverse, from the back to a little bit away from the nose. Then insert them into each other to make a cross section and hot glue them into place. See images 1through 3.

Now cut out long strips of whatever width you want. These will be hot glued to the edges of the cross section. See images 4 - 6.

Here is where it gets hard. Cut strips of whatever length and width will work for you and start wrapping them around the form, hot glueing them to the boarders made in the last step. Keep adding strips until the entire form is complete. See images 5 through 7.

To make the horn, do the same thing you did to make the legs except cut and bend to make it pointed instead of round and blunt. Test the placement and cut the bottom of the horn in an arc so that it fits flush with the head at the angle you want. Hot glue it into place.

Draw on the eyes and mouth.

NECK

Cut a strip long enough to go from the head to the wagon to be the length of the neck you want and wide enough so that the edges meet so that the neck is as thick as you want. Bend the cardboard so that it wraps around like we did to make the legs and hot glue the ends together to make a cylindar. Place the head and hot glue it in place.

Test the placement against the wagon and cut the bottom of the neck at an angle so that the neck aligns with the wagon at the angle you want the neck to be.

Step 5: Lady Rainacorn Build: Extra Passengers

Since we were going all out and had other people joining us to represent the characters, we decided we needed to represent as many characters as we could in other ways. So, I chose some characters and did so.

Get 2 lengths of cardboard that is about as long as the side panels.
Draw the characters you want
Paint the characters and paint the background black
Cut the cardboard down around the heads of the characters (if you want)

When finished, you'll have a set of characters to "ride" in the back wagon on either side. Just position and hot glue the bottom section of the character strip to the inside top of the side panel.

Step 6: Lady Rainacorn Build: Assemble and Paint

All the parts are made!! Woohoo!! Now time to assemble them. You can either assemble them and then paint, or paint and then assemble either way. I painted the front half assembled and the back half unassembled and the stripes didnt exactly line up.

Draw out the stripe placements on the neck, front, back and all side panels. Try to make the stripes on the front wagon line up with the ones on the back wagon. Paint it all. The head is light pink, the horn is white and I used a photo as reference to paint the stripes which use light pink, dark pink, blue, green, yellow, and red.

Assemble the pieces. Start with the side panels, then add the front and back panels and then the head.

The side panels should just sit without any other attachments.

You can hot glue the little bit of the side panel that extends past the front to the front panel to hold it place. Don't glue the side to the back yet because you will need to remove the back panel to put in the poop chute later.

My wagon has a metal bar that was a convenient way to attach the neck. I just cut a strip of cardboard and hot glued one end to the neck under the bar. Then lay the strip over the bar and hot glued it to the neck above the bar so that the bar kept the neck in place. This way it is easy to disassemble to transport and then just rehotglue it. If your wagon isnt like mine, you can just hot glue the neck to the front panel.

To connect the two wagons together, We attached the handle of the back wagon to the bar at the bottom in the back of the front wagon using metal clips and zip ties. We tried attaching the side panels in the front to the ones in the back but the wagons wouldn't turn well so it's best to leave them unattached.

For the tail and the mane, I used a furry fabric. Just cut the shape you want, arrange it how you like and hot glue it in place.

Step 7: Poop Machine: the Conception

So, I'm not very knowledgeable about electronics.... but I wanted Lady Rainacorn to actually "poop" the awesome unicorn poop cookies created by kristylynn84. <------- total inspiration for the creation of the poop machine

You can follow her instructable on unicorn poop cookies here:
https://www.instructables.com/id/Unicorn-Poop/

The first step was coming up a design that would drop cookies. I wanted the cookies to be loaded into this device and one at a time over an interval be dropped down a chute out the back end of the wagon right under her tail.

The design I settled on was a conveyor belt. I wanted to make it as long as possible and still fit in the wagon so the maximum amount of cookies could be loaded at a time. For the original plan, I wanted it to run on an interval in which it would spin one rotation to drop one poop and then wait about 5 minutes before rotating again. I was thinking that this could be accomplished with a servo and an arduino.

I got the servo and arduino wired up with the example sweep code and tried to alter it to spin 360 instead of 180, but I did not know that the servo was made to only turn 180... so not what i need. I found instructables on how to modify a servo for continuous rotation. Being the electronically impaired person I am, I went to a friend for help. Using a combination of 2 instructables and a bit of his own tinkering, his Lord of Awesomeness got it to turn 360 continuously! The down side was that it wouldnt stop. Somehow we lost the control. It wouldnt follow any code we tried at all.

So, we decided that was ok, it would still turn the conveyor belt. We were considering just adding a toggle power switch that we could discretely activate. Not as cool as the unicorn pooping on its own when none of us were around it but it would work.

However, while trying to use a power source other than the arduino, we acidentally fried the servo with too much juice. There wasnt enough time to order another one and modify it and finish the build before Halloween, SO...on to Plan C.

Plan C: Still using the conveyor belt, we used a remote control car to provide the rotation. All we had to do was tape the wheel to the spool we used as a wheel for the belt and figure out how to mount the car in the build to allow for the rotation.

Gather your materials for the poop machine build:

Remote control car and controller
2 cardboard spools (i think used to hold ribbon)
Nylon webbing (like on back pack straps)
needle and thread
Unicorn poop cookies (materials needed are in that instructable)
cardboard
hot glue gun and glue sticks
scissors/ box cutter
duck tape

Step 8: Poop Machine: Conveyor Belt

The Nylon webbing I bought wasn't wide enough for the design so I lined two strips up and sewed them together. See photosw 1 +2.
The wedding should now be the perfect width for the spool.

Now we need to build the conveyor belt base. Get two long cardboard boxes. We used a pizzarolls box from Walmart after the employee stocked the freezer. This part worked well having two of the these boxes so that you dont have to worry about sizes not lining up.

Cut or tear apart the side where the box is connected to make one long piece of cardboard.
Put the webbing on the two spools and hold it together to make a belt. With hep, pull apart the spools to the length you want the conveyor belt to be and draw a rectangle around each spool on the cardboard. Sit the belt and spools aside and cut out the rectangles. ( photos 3-6)
NOTE: the belt wont work if its stretched tight. it needs some slack. We had to resize our holes to give more slack.
Now thread the webbing through the holes. Put a line of hot glue on the edge of the end of one end and press it into the other end to make a belt. Hold until glue is dry. Now use needle and thread to sew the ends together for extra hold. (photos 7+8)
This now keeps your belt on the base and you can insert the spools with ease.

We need something to go through the spools to allow them to spin and to hold them in place on the base. We cut a small strip of cardboard, score it down the middle lengthwise an fold it over. then slide it through the spool. It should be sized to allow the spool to rotate freely and stretch from one side of the hole to the other. Do this for both spools. Sit these pieces aside for now.

To finish the base get the second pizzarolls box and cut or tear it like we did the first one to make one long piece. Lay it down and pull up the flaps. Place the top piece with the belt over the second box and pull the flaps down. This way the flaps from both boxes should overlap and this should make a long open ended bow of sorts. Hot glue the flaps together. (photos 9+10)

Now put in the car. Take one spool and duck tape it to one back tire of the remote control car. Duck tape it all the way around the spool tightly so that the spool edges are bent back toward the wheel so it doesnt get in the way when cookies are added.

NOTE: Go ahead and use hot glue to reinforce the area where the spool center meets the thin cardboard edge. Ours came apart later when trying to operate the belt and had to hot glue it back together.

Note: be aware of the direction in which the wheels spin. We want the car wheel to turn so that the car is at the front of the belt, driving the belt toward the car. This is important so that you place the hole for the poop cookies to fall into in at the correct end of the belt.

Trim down the other side of the spool attached to the car so that the cardboard end is only a little higher than the spool center to allow for wider cookies to pass. (photo 14) I cut mine down too far and had to build it back up a little with hot glue layers

Alright, now we have to cut out a place for the car for sit in the base so that the spool sits right in the opening. Position the car with spool attached to see where you should cut out a hole. Mark the place and cut out the hole. (photo 15)

Insert the small strip from earlier into the spool and test the fit on the base. (photo 16) The car wouldnt stay in place so I had to build in some support to hold it up on the outside. First I cut two strips of cardboard to reach across the whole I cut. Glue the two strips together to make it one thick strip and then glue it across the hole on the edge of the base. (photo 17+18) Next I added some support on the outside to hold the car up under the wheel. Cut a long strip wide enough to fit through the whole and bend it so that it sticks up to support the car. Hot glue it to the inside of the base. (photos 19-22) Use some duck tape to add extra hold. (Photo 23)

Now the car should be in place.

The spools need some traction to grab and pull the belt around so add several rubberbands to both spools. (photo 24) Put the belt on around the spools

Attach the spools:
Position the center rod strip to the base so that the spool can spin freely while staying in place. Cut a thin strip of cardboard and hot glue it over the rod strip to hold it in place (photo 25+26)
Insert the other spool with belt already on it into the other rectangular hole. Insert the center rod strip and position it against the base. Duck tape or hot glue into place (photo 27+28)

Cut an opening in the top of the base in front of the conveyor belt where the poop cookies will fall into off of the conveyor belt. (photo 29)

Photo 30 shows a view from below

The base needs a little support on the inside on the right side. Take a strip of cardboard and make it into a column using the same technique as before for the legs. Cut to size, insert, and hot glue into place. (photo 31+32)

Test out your set up. Make sure the belt is turning and will pull some weight. Test it out with an object. I used old cupcakes from the fridge. On mine, the cupcakes would fall off near the end and get stuck so I had to add a wall to prevent this.

Get a long, wide strip of cardboard and fold it in half. Glue the ends together to make a thin wall. Position it at and angle to direct the cookies and hot glue into place. Cut two other smaller strips and use them as braces on the outside of the base to hold the wall up. See photos 33-35. This wall still wasnt working 100% of the time so we added another smaller wall. (photo 36)

Finally, we need to construct the poop chute.
Get a long, wide strip of cardboard and bend it into an arc. (photo 37)
Test the fit by inserting into the end of the base and testing the angle. Figure out how tall we need make it stand. Cut another strip of carboard and bend it into an arc. Position it around the top of the chute so that it holds the chute up. Test the fit and when it sits at the right height glue it on to the chute. (photos 38-41) Insert the chute into the base and test the whole thing out to see if the cookies will roll off the belt and down the chute.

Step 9: Poop Machine: Instillation and Poops

Now that the conveyor belt is working and we have poop chute, we need to attach it to the back panel and cut a poop hole as well as install it in the wagon.

Our conveyor belt build was a bit longer than our back wagon so we had to build a stand of sorts to brace the build in the wagon.

First cut a piece of cardboard to fit flat down inside the wagon. Insert it and hot glue it down to the side panels. Now cut a long strip of cardboard and fold both ends so that it sits like a table. It should be sized so that when it is standing, it is even with the sides of the wagon in height. Test the fit and adjust if needed. (photo 1)

Remove it and cut in half length wise. (photo 2) This makes two table like structures.

Position them in the wagon, one at the back and one somewhere between the front and middle. Hot glue them into place. (photo 3)

Position the conveyor belt build on the braces where you want it (the end should be lined up with the back of the wagon) and Hot glue it to the braces on the sides. (photo 4)

On to completing the chute. Insert the chute into the blet build and hold up the back panel to see how to size the chute. Cut down the chute to the correct size. Now cut the end of the chute so that it comes to more of a point. (photo 5)

Align the back panel and mark where to cut out the poop hole. Lay the panel down and cut out the hole. (photo 6-7)

Now we need to build some sides to funnel the cookies down to the end and keep them from falling off the chute. Cut out some cardboard and fashion is so that it follows the form of the chute and sits flush against the back panel. See photos 8 and 9.

Align the chute with the poop hole and hot glue into place. (photo 10) Cut a strip of cardboard and hot glue over the seam for extra hold.

Remove the chute build and put hot glue along the bottom of the part that sits in the belt build and reinsert it and hold down into place until glue dries. Hot glue back panel and side panels together to finish it out. (photo 11)

Now that it's all built and ready to go you need to start baking like a maniac to make enough poops to last a while.

When all the poops are made, decorated, and cooled you need to individually wrap each one in plastic wrap.

Step 10: Extras: Trick-or-treat Bags and Tunes

I figured since everything about this is adventure time, we cant very well have trick-or-treating bags that arent! So, I bought some simple canvas like bags from the dollar tree that have some halloween designs on one side but are blank on the other.

My kids picked the character they wanted so I drew flame princess on one and meemow on the other and painted them.
See phtotos 1-5

I also thought that it would be more epic to trick-or- treat to the theme song! So I found some youtube videos of adventure time music and used a program called 123 DVD to convert the videos to a file type for my ZUNE. Then I loaded the videos on my ZUNE. We brought along a small bluetooth speaker called the Veho 360 and wired it up to the Zune to amp up our awesomeness.

We went for a test run of the rainacorn build to a Halloween thing and discovered that many people.. mostly older parents... had no idea what adventure time was ( A tragedy, I know!) SO at the last minute we decided that we should educate them. We built a holder of sorts to hold the Zune up attached to the back of rainacorn so people can watch the music videos as we go. That way people can have Poop and a Show!!
See the remaining photos.

We also bought 15 of those led candle things. They sell 3 packs at the dollar tree with batteries included. We used velcro to attach them to the sides and front of the Unicorn so as to be visible while trick-or-treating.

Step 11: Final Awesomeness

Now we have our pooping Rainacorn ride with extra character riders, music videos, 100 delicious poop cookies, Finn with his sword, Jake, Princess Bubblegum, Fiona, Marceline with her base guitar, and Ice King. But, we had to include the other parents in the group who helped me out SO much in this venture. So we have the Unicorn Engineer and the Cook! The Engineer was a big contributor to the unicorn and poop machine and was in charge of operating the pooping. The Cook was a big help with the cookies and the transporting, loading, promotion, distribution and conservation of the poop. Thanks guys!

Now go out there and have some fun! Spread the poop!!

Be prepared to be mobbed by groups of kids for poop, followed by little people waiting for poop and stopped for photo ops by big fans :)