Pudding paint is awesome to use as an edible finger paint. It's only 3 ingredients, and super quick to make.
Instant Pudding Mix
All you do is mix up the pudding as it states on the box. Put the pudding into individual bowls (we used 4), and put a few drops of different colored food coloring in each bowl. Stir up and get painting!
We like to use wax paper or freezer paper to "paint" on.