Kandinsky inspired discs - color clear plastic cups with Sharpies, then melt gently in a 250 oven. Could also bend while pliable for a Chihuly effect. From Arts for Life. I personally would designate a toaster oven just for these crafts.
Another pinner: Foamboard Core dollhouse. I love that they use magazine cutouts and scrapbook wallpaper for the details.has a link to the tutorial for building the doll house.
Didier Triglia is a French artist who creates art in a wide variety of media. This particular lesson is influenced by his paintings made from crushed cans. This is a wonderful recycled art unit that can inspire many different types of art projects from 2D to 3D.