Here's what you need: some rocks, or "stones", preferably smooth; water and a paintbrush. I'm not really sure where all these rocks have come from . . . I think I have picked them up here and there on trips and such. Aren't they pretty and smooth?
Here's why you should do it: This is a perfect introduction to using a paintbrush! It's not messy (unless the cup tips over and spills on your tax return) and is mesmerizing to see the rocks change colors. The water dries very quickly and you can do it all over again! A very "green" activity! :)
I don't really have to explain this one . . .
We still had a good time, though. :)