Also please excuse a couple of the over exposed pictures. It helped to show the tape. And I know this Instructable isn't much, but it's something I've always wanted to do.
Step 1: Gather materials
-Two candy boxes. Can generally be any shape and size, but both should be the same.
-(optional) cool decorative knife
I found the candy at Walgreens. They have a sweet deal on a lot of the old school candy. Three boxes for three bucks. It will also works with boxes as small as Dots.
Step 2: The outside box
Start by cutting all of the flaps off the front. You may have little bumps where the flap folded. You can cut this off and make it look better if you want.
Next tape the four sides putting the tape half way one one side and folding over the side. After you tape the four sides put a piece of tape on the corner and cut it down the middle (note: cut the tape only). After you cut the tape, fold the rest inside.
Tape the back just for safe keeping. Put one large strip across and then cut diagonally toward the corner (see picture 7) on all four sides. Fold the top and bottom strip over first and then fold the two sides.
The outside box is now finished, so lets move on to the inside.
Step 3: The inside box. Taking the top off.
After it's open the first thing to do is put a strip of tape across the front. Cut diagonals and fold the tape over like before.
The next step is to get your box cutter out and cut the top of the box a little behind the front like in the third picture. The your going to get your scissors and cut the top off, but leave the front, back and two sides intact.
After you have taken the sides off the next step is to clean up all the edges. Cut all the excess off the top edges. It should now look like the last picture.
Step 4: Making it fit
Your going to want to cut off roughly half of the sides and back. It doesn't really have to be perfect, but you can if you want to. I drew a line on the side to show how much you want to cut off.
Whatever you do don't cut the front.
Now that it fits all thats left is to reinforce all the sides.
Step 5: Done!
These also make great gifts. It's always nice to get a gift that took some time and effort to make rather than something that was purchased. You could write a happy birthday wish inside and even make a cheesy pun about candy.
Thanks for viewing my Instructable. Feedback is greatly appreciated.