Rock painting is one of our favorite sunny day crafts. Its easy and requires no cleanup. I bought some non-toxic paint called Eco-Paint from Imagine Childhood a while back for our craft collection. They also make a non-toxic playdough, which is good for little B since he has a hard time keeping things out of his mouth. The only new challenge I have with rock painting is keeping a paint war between the two little ones from breaking out. With rocks involved it could quickly turn from creative to violent. So far distance between the two seems to keep the peace. When negotiations get heated when trying to switch color usage, my roll becomes peace negotiator.