I got this idea from
Pink and Green Mama. I like it because I am not very crafty and a lot of crafts I find require all kinds of crafty supplies I don't have on hand. But with this one all you need is your old, broken crayons, that's it! I didn't have Pink and Green Mama's cute little heart tray, but it was fun experimenting and finding what works. We used a muffin tin to do circles and cookie cutters wrapped in tin foil for some different shapes.

First step - sort your crayons and find all the old broken ones.