This is my 1 person tarp tent that has an optional door. It's small and light when folded. It's cheap and easy to make and doesn't take much time.

What you need:
     8'x10' Tarp
     4 Tent Pegs
     1 Hiking pole
     A type of guyline[I used 10ft of paracord]
     Sharpie
     Paper
     Scissors
     Measuring tape
     Hole puncher
     Paracord scraps

Step 1: The Model

First I started out with a piece of paper. I cut to match the tarp so a 8'x10' tarp = a 8"x10" paper
I marked the paper with a Sharpie where the grommets are.
Since I didn't want to add grommets I cut it on the dot in the boxes that are on the picture and made a triangle.
Then I folded the paper in half.
This is the model I went off of.

Step 2: Cutting the Tarp

Draw a line from the bottom center grommet to the 2nd to the top grommet, another line from the bottom center grommet to the 2nd to the top grommet on the other side, and then draw a line to a 2nd to the top to the other 2nd to the top. Look at the previous step and it will show you where to cut also. [The grommet in the boxes]. It will be excaltly the same as the model.

Next thing you do is cut the lines with the scissors. Make sure that you cut on the outside of the grommets instead of the inside ans that you leave some of the tarp around the grommets.

Step 3: Setting It Up

First lay it out flat and put a tent peg at the top of the tarp. Then you take the hiking pole and pull it out to 3' and take the cap off the end. Stab the end into the ground [If you can't becuase of the terrain that's fine]. Put the hiking pole under the tent and lift it up. Peg in the other two sides. To attach the guyline I tied a loop out of two overhand knots that slides so it tight down on the top of the hiking pole[The loop works like a snare or lasso]. Put the loop over the hiking pole and tighten it and feed it through your hands down to the ground about 4' away from the hiking pole. Tie another loop by doubling the guyline and tieing a overhand knot. Grab the other tent peg and put into the ground. Loop the guyline over the peg. I suggest that you pound the tent pegs all the way into the ground.

Step 4: Making the Door and Adding It.[Optional]

After you set it up you can add a door that can be put away when not using it. Take one of the bigger scraps of tarp and put the corner of the tarp next to the top. I suggest you use the Sharpie so you can get a cleaner cut than I did. The top off the corner is going to be at the top of the tent as shown. After you cut it, slide the corner of the tarp up the guyline. Hook the bottom grommet to one of the tent pegs as shown. Next you take the hole puncher and punch 3-5 holes on the other side of the door[The side that's loose] but make sure that there is one on the top and one on the bottom. There might be a grommet or two so you don't have to punch holes there. Also make sure that you cut one hole on each side of the door and the tent right across from each other. Take the paracord scraps and put them through one hole and through the other hole and tie them [Do this for each one]. To put the door back you take the grommet off the tent peg and throw it back onto the tent or you can roll it up and tie it to the side.