Practical Pet Rock Craft - Lady Bird & Bumble Bee Tic-Tac-Toe game - hand paint rocks and a tree stump for a home made outdoor game. More creative ideas @ themicrogardener.
This looks like one of the easiest water walls I've seen. Fun with water, great recycled plastic bottle project.
"Textured Painting - Natures Paint Brushes" This is not just art, but art in nature! Go on a nature walk to gather 'schtuff!' Then use what you gather to create art or As art!