have you tried 'bubble art' yet?! by adding food coloring to the kiddos bubbles, then letting them go to town on a paper covered surface, a fun abstract piece is created. plus they'll remember it forever. plus, plus it's a great indoor activity during this loooooong winter.
gotta love that.
o, and we have used both printer paper & watercolor paper. printer paper works fine for an easy grab and go, but it does tend to curl as it dries. if you use watercolor paper, you'll avoid that.