To make them, just save all those broken, useless pieces of crayon throughout the year. Take the little pieces and fill the tin cups just until full but not to overflowing. Preheat oven to 250*F. Set pan in oven. Bake for 10-20 minutes, just until all crayons are melted. Set pan on cooling rack. Cool completely. When crayons are fully hardened, press around the edges until you feel them pop free. Turn pan upside down on cooling rack. You now have fun crayons that will change colors as the kids draw/color with them.
They make great party favors or fun gifts to give. This year we are including them in the treat bags for our daughter's class. We completed the bags with bookmarks, stickers, pretzels and candy. She had a lot of fun and is really proud of the fact that she "did all the work".