It would be interesting if it could watch you draw, then imitate your style as it draws other subjects. It isn't fun to re-draw the same subject over and over just to see how you progress. Instead you could use it to take each of your drawings and show you, say, a lightbulb would look. Plus it would be fun for people like me who like to draw on occasion but quickly get lazy. That way I could just draw half of something and let the robot finish it. Heck, you could use it to do one of those photo-every-day things, but instead of a photo it's a self-portrait based on your current drawing ability.
Of course, if it became complex enough, it could analyze money and learn how to mimic that drawing style...