Bowls made of confetti! Great recycling art project--save all those leftover paper scraps (put in small bowls at each table). Collect a bunch and have the kids cut them up; Then make bowls made from confetti.
As a really common recycled material, wooden pallet you might have used them to make something useful for your home. You know they have endless potential can be transformed to a lot of stunning DIY projects serve for home.