Good idea...if eventually eaten. Don't like the idea of wasting food.
Many craft stores (Ben Franklins, Michael's, even Walmart I think) and kitchen stores sell what they call "bark" which is in two forms -- chunks/bars and "drops" -- to melt and put into molds. They are already in a variety of colors, but I'm sure you can add food coloring to the white bark. I'm thinking you could let them draw a simple design with dark lines or use a pre-drawn picture for younger kids, place wax paper or something clear and heavy (overhead transparency?) on it, then paint within the lines. Once hardened they could easily peel it off and eat.
I like this idea and just might have to give it a try!
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