One final use of the Lego mold for this party (I might think of some others for our next Lego party, I have 2 boys) is melting broken crayons for the gift bags. I've read about how easy it was, but hadn't tried it before. It worked like a charm! 7 mins at 300 degrees and this is what we got!
After letting them cool they un-molded great. They are shorter than the other stuff I made because I couldn't fully fill them, but they color and that's the best part! Although it was much harder to clean the mold from the crayons than any of the candies were. I had to really scrub it off. Because I want the mold to stay food safe I'm not sure if I'll use it for crayons again without a bit more research.