Found this article on little birdie secret's she got from her friend Bonnie Rains. Such a great idea! I have seen this done with old crayons in metal muffin tins....I thought the silicon mold idea is great!
Recycled Crayons Tutorial
Who doesn’t have broken crayons at their house? Instead of throwing them away, recycle them into fun new crayons! This is a great project for kids to help with.
First, find all your broken crayon pieces and remove the paper from each. Then break them into smaller pieces (about one third to one quarter of the regular size crayon). Then have your trusty assistant help you sort them by color into your favorite silicon mold (or you can use regular cupcake pans with foil liners). I chose to use a star design because I thought each point on the star would make a nice new pointy crayon.
Place your silicon mold with crayon pieces on a baking sheet and put it in the oven at 200 degrees. Heat your crayons so the wax melts completely. I thought this would take 15-20 minutes, but actually took closer to 30-40 minutes. When the wax is melted remove the pan and let your crayon’s cool. Once they are cool you can easily pop them out and admire all the pretty color combinations you created in your brand new crayons!