Gather crayon pieces. Remove the wrappers and discard the paper.
Preheat the oven to 250 degrees.
Fill each heart mold with crayon pieces. Break large crayon pieces to fit entirely in the mold.
Line a flat cookie sheet with tin foil. Set the heart tin on the cookie sheet.
Place both pans in the oven. Bake the crayon pieces for 10 to 15 minutes or until they are melted.
Remove the pans from the oven, using oven mitts. Let the crayons set until the wax has hardened and they are no longer warm.
Smooth out rough edges of the crayon by rubbing them on a piece of scrap paper.