I learned this from a friend on Facebook and had to try it for myself.
1. Take all of your old crayons (wrapping removed) and break them into small pieces (if not already there). Sprinkle them into a muffin tin. (I used a mini-muffin tin here.)
3. Once cool, place the pan in the freezer for a few minutes, then pop them out of the pan. Voila! New multi-colored circle crayons!