Another great way to do this is to use candy molds! My sister in law made new crayons for my son by heating the old broken ones in an old pot and pouring them into candy molds. She separated the colors so he would have single color crayons, but multi-colored are great, too. I’ve also seen a tip in a magazine where you can make cute valentines by just using red, purple, pink, etc. and making heart shapes. Tape the cooled heart shaped crayon to a piece of cardstock with the words - “You color my world, Valentine!”