Just used a roll of white paper from the teacher supply store and hung it on the wall. Used crayola washable finger paints for easy clean up. When they were done I took the top down first and then just balled it up and tossed it. Very easy :)
It's way too hot to play outdoors every day!! We recently stayed cool by having an art day indoors. It was a huge hit so we will definitely being doing this again.
Now go check out Angela'sawesome view of summer