Another pinner says: Mess Free Finger Painting! What an awesome idea! Paint in a ziploc bag taped over a piece of paper. Of course we'll have to REALLY finger paint sometimes, too, since getting messy is half the fun.
10 Awesome Fort Ideas To Build With Your Kids - Page 5 of 10 - Reach for the stars without leaving the house! This adorable starry night box fort is just one of 10 awesome ideas to try with your kids. (via Life As Mama)
DIY Sand and Rock Box by FSPDT. Gdjk -> made this with toilet rolls (aka tunnels) and moon sand instead of play sand. My son loved playing with it. The moon sand cleans up nicely indoors but play sand will be easier to play with when using the small cars.