Party Doodles is a fun drawing game that has an interesting twist. While you can play with just an iPad, adding an Apple TV to the mix allows you use AirPlay, transforming this into living room fun for the whole family. Here's a pic of the game in action.
Personally I think this is a great way for developers to use the Apple TV to enhance gameplay for an iOS game. Party Doodles is right at home using the larger screen, and it almost begs the question why you'd need an App Store on the Apple TV.