While setting up my room last week I cleaned out the old crayon boxes of broken pieces and filled them back up with fresh crayons. (Oh the beauty of a box of new crayons!!). I soaked off the paper from the old crayons and then found two ways to transform them. A selection of sorted crayon pieces in neutrals, warms, and cools ended up in my "ART" mosaic on the door. The rest have been recycled into new multicolored chubby crayons.
Since I only had the 3 crayon batches going at a time, it's been slow going. However my bag of crayon crumbles has now transformed into about 30 new multi-colored crayon disks that fit very nicely in the hands. The best use of these, I believe, will be for doing texture rubbings. The analogous color blends create instant interesting color on the page. I've also considered using these as reward prizes throughout the year, but maybe that's something to do with next year's batch of crayon bits. Maybe by then I can also find a nice silicone candy mold to make cool shapes instead of discs.
Moral of the story: no kid wants to use a broken crayon, but every kid has fun with a multicolored crayon, and this project saves money in the budget while creating something awesome for the art classroom!