The kids absolutely LOVED making these and watching them shrink in the toaster oven! Last year when I made Shrinky Dinks, I melted them with a heat gun. Some would curl and mess up (several did, actually), but in a toaster oven they do much better. The kids thought it was just "the coolest!" That always makes this art teacher smile. They were given a simple triangle and told to design an abstract tree. They made zentangles and animal stripes...very creative, don't you think?