Balloon formed papier mache bowls covered in fabric! Can also be done over a bowl to give it the flat bottom necessary for placement on a table. Just put a thin coating of petroleum jelly on the bowl for ease of release when papier mache is dry.
line art group project -- I would like to do this with computer graphics. Maybe with instructions that each student make a slide on powerpoint where something must start/end at certain grid points on the sides of the paper (a road, a ball, a line.
We made these awesome bottle cap flowers at our school sleepover last spring. The kids loved making them. SO easy, just a lot of prep between collecting *CLEAN* caps and drilling holes in them. A great recycled art project!
Garland from Woven Paper Balls-- These are made out of paper and one piece of tape. You can cut your own strips (mine are wide and long, which yields a ball that's about 1 in diameter) or use shiny paper ribbon.