If you check out this demo of a prize winning video game

http://www.kloonigames.com/crayon/

I think you will agree it is a pretty cool idea. According to an item in the Chronicle of Higher Education, the creator now wishes he hadn't posted a video of it on YouTube. It seems there are already copycat games coming out that steal his thunder:

http://chronicle.com/wiredcampus/article/2763/carnegie-mellon-student-learns-a-pitfall-of-youtube?utm_source=at&utm_medium=en