Last week we had some kids over for a playdate to make big, swirly crayons. I've wanted to do this project for ages, and I've been faithfully saving our broken crayons. We pooled our "savings" with a few other families so we would have enough to fill up the muffin tin.
Make sure to grease the muffin tin with Pam or something similar, then add the broken crayons and melt them in a 250 degree oven for 20 minutes, let cool (we sped up the cooling process in the fridge), pop out of the muffin tin, and voila! Big multicolored crayons that little fingers can grip.
They're so cool-looking!
I found a cool site with tons more projects for broken crayons: http://www.thriftyfun.com/tf666289.tip.html. Can't wait to try more.