Took me a minute to grok what was happening, but once I did it provided around 5 minutes of amusement. I'd love to see it developed further with additional, uhmm, brushes? Not sure what to call the things that actually paint and mod the canvas... Kudos to whoever made it, though. Very creative!
I'm confused, are there controls other than clicking the "No" and "Paint" buttons?
EDIT: Apparently, I was wrong. See below.