To make a river stone mat first you must collect or buy river stones. After that take a plastic mat and organize all of the stones on it. Then stick all of the stones one after the other to the plastic mat through the use of silicone sealer.
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.