This is a fun project, but requires adult supervision. Instructions are courtesy of

        crayons (old or new)
        metal or silicon muffin tin 

1. Start by peeling off all of the paper labels. Then break the crayons into small pieces.
2. Evenly divide the broken crayons into the muffin tin cups; fill about half way
3. Bake in 230 degree (F) oven for 15-20 minutes. Watch them closely and pull out of oven as soon as they are melted.
4. Allow the pan to cool completely. The crayons may be easier to remove if the pan is refrigerated for a bit.