Flowers made from plastic water bottles. One can't just go out and buy spray paint in Chicago, it's against the law, so I offered the spray paint that I already had, they loved the color choices!
For one of the middle school art periods I put out some glue guns, some tacky glue and any and all recyclable materials I could find. The pictures are the result of this experiment before they were painted. Oh and a new lesson learned: do not spray-paint Styrofoam. It melts away.