I bought these ice cube trays at the dollar section at Target. I also saw them at the dollar store the next day - pretty popular little guys! I have wanted to get rid of all our crayon nubbins. And, while I didn't get rid of all of them, I did make a dent in the red, pink, white, and orange ones. I broke them up and put them in the heart trays. I put them in the oven at 250 for about 15 minutes. When they cooled I popped them out. I think I will give them to my little guy's friends for Valentines Day with a pad of paper. Now, I don't know how easily I can get that crayon film off of the mold, but if I can't it will be designated for dirty crafts only and that's okay because they came in sets of two trays and I didn't touch the other one...yet.