So, I’ve seen this melting of the broken and forgotten crayons lots of places, and I finally tried it out myself. Actually, I stole the directions from this lady’s blog: http://www.imagineourlife.com/ Her blog has tons of awesome free quiet book patterns as well!
For the nice round shape of the crayons I just used a regular muffin tin.
My almost-four-year-old helped me sort the colors into the muffin tin, and after they were finished she loved coloring with them.
But most of all, both of my daughters loved stacking them over and over, and hiding them around the house like buried treasure. Lots of fun and worth the effort… not to mention SO EASY. I also feel good about using up all of our broken crayons.