I put all the crayon pieces in a plastic zipper bag and let the kids hammer, stomp and dance on them until they were all broken up into little pieces. It actually works best if you make crayon shavings with a pencil sharpener or grater, but ours were too far gone to use either method.
Once we had our crayons crushed, I gave each little Knucklehead a piece of wax paper folded in half and let them sprinkle on the crayons pieces. I then sandwiched the waxpaper between two paper towels and ran a hot iron over it to melt the crayons.Once the melted crayons cooled, I helped the kids cut out some fun shapes and then they added colorful pipecleaners for extra decoration.
~Gridiron Girl