He wasn't quite sure what to make of it at first and needed some gentle encouragement, but was happy smearing the potato flakes around for a little bit. He definitely tried to eat some, which I was anticipating. Although I'm not quite sure he got the concept, he seemed to be curious nonetheless. It pained me a little bit to admit that I probably spent more time cleaning up than actually painting, but I think we still had fun and I have a pretty neat (albeit lumpy) picture to show for it.
If you are curious about clean up, the food coloring was sufficiently sucked into the potato flakes that it didn't make a mess and wiped up nicely. The only bit that didn't wash off immediately was the couple of drops I got on myself when making the potato paint in the first place. Overall, a success! What are your favorite indoor activities? We're always open to suggestion.