Build a clone of yourself in several hours for less than $15. Useful for various art projects, sewing clothes, or freaking people out.

Materials list:

1 box plastic wrap - good quality so it sticks to itself well
2 rolls packing tape - good quality so it doesn't tear easily
1 pair scissors

The above list is for a small person just under 5', so you may need more to cover your surface area. Another roll of packing tape would probably be enough.

You will want to try this first on a small bodypart, for example your foot. Wrap some plastic wrap a couple of times around it, making sure to cover all surface area. Then take the packing tape and wrap it all around the plastic wrap, covering every part of the wrapping. Your foot should now be encased in plastic.

Take the scissors, and gently cut alongside the heel area, then along the side of your foot towards the toes. You'll want to cut just enough to release your foot from the plastic. Once your foot is removed, take some more packing tape and tape the cut area back together again, maintaining the shape of the foot.

You should now have a hollow plastic foot, ready to be used for the rest of the project.