1. Parents can use the knife to chop crayons into pea-size pieces, taking care to keep colors separate so kids can combine them as they like.
2. Preheat the oven to 150 degrees while children fill the tin with crayon pieces, arranging them in interesting designs.
3. Bake just until the waxes have melted, 15 to 20 minutes.
4. Remove the shapes after they have cooled. If they stick, place tray in the freezer for an hour, and the crayons will pop out.
(via petit elefant)