There are tons of "paint" recipes floating around the internet and Pinterest. They are all the same.....
Add equal parts of corn starch and water together, mix well, then add in food coloring to tint your paints.
I started off mixing 1 c. of corn starch with 1c of water. It made plenty. But I had a handful of kids using it, so I made a second batch. I filled this old muffin tin, then put a few drops of food coloring in each to make as many different colors as I could.
The kids like using all sizes of old paintbrushes and came up with some very clever creations. They also liked just splashing the colors together to make "fireworks".
The best part is that the paint cleans up very easily off the kids, and washes away off the sidewalk or driveway when the next rain comes through.
This definitely will be a classic summer activity to repeat every year.
Here are some more pictures of the paintings: