http://www.etsy.com/listing/43616549/construction-trucks-crayon-set
I LOVED the idea but HATED the price. I decided to make my own. I found some chocolate molds shaped like cement trucks at ebay for $5 (including shipping). You can get almost ANY shape you like.
Materials:
Plastic chocolate mold
Large pot with water
Metal bowl that will fit on top of the pot
Wax paper
Tooth pick or other utensil you don't mind getting wax on
Instructions:
-Sort crayons by similar shade, strip off the paper, and break into smaller pieces
-Fold the wax paper so it creates a centered crease. Place a shade of crayons in the center and place in the metal bowl. Allow the crayon to melt completely. If crayon starts to separate into a clear and colored portion, stir with a tooth pick. By folding the paper before you melt the crayons, it creates a clean line for the crayon to flow down.
-Let the crayons sit until they cool completely. You can put the mold in the fridge/freezer to speed up the process if you want. Once cool, the crayons should pop right out. Enjoy your awesome recycled crayons!