Jude and I made this washable paint the other day while Ellen napped. You use paintbrushes to "paint" the sidewalk...a different twist on ordinary sidewalk chalk (which by this time of the summer is long gone around here). I don't remember where I saw this "recipe," but it was fun to make with my Best Guy!
Mix together cornstarch and water until you reach a milk-like consistency.
Add food coloring. (Jude chose blue and yellow...and then dumped a bunch of green on top of the yellow...so we did blue and green!)
(Don't use too much cornstarch or the paint will be too thick to spread well.)