Crayon Ideas?

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I have several shoeboxes full of broken, peeled crayons. I don't want to just throw them out but am out of ideas of what to do with them. I have already made chunky crayons for the little ones using muffin tins, & my kids & I also used an idea from Martha Stewart, she made Valentine's by melting shaved pieces on wax paper. We did the same idea but just made all kinds of pictures, not just for Valentine's. That's all I can come up with. Anyone have any other ideas? Especially anything that isn't just a kids kind of craft, although any ideas will be great.