Use yl oils. DIY Aromatherapy Terra Cotta Pendants -- stamp beautiful designs into clay + bake. Thread with string and dot with essential oils -- it's a diffuser you get to wear! Would make awesome gifts!
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.
20 Fun and Creative Crafts with Plastic Soda Bottles