I didn't have time to read all posts, so someone may have mentioned this, one year I took all my old crayons, broke them into small pieces and then melted them into a candy mold (metal) in the oven! It makes some great multi colored BIG crayon chunks! AND IT DIDN'T COST A THING! It would be cute to make them into hearts! But if you don't have a heart mold you can use a muffin pan. I think I sprayed with Pam before heating.
"Isn't it wonderful that no one need wait a moment to start to improve the world." - Anne Frank