Dinner Conversation - Facebook

We were invited at a friend's place for dinner - traditional German cuisine *yummy* One of the conversation topics that came up was - facebook, which is one of those social networking websites. We were all wondering why we didn't come up with the following marketing idea:
Design small little images of bears, turtles, ducks,... and other cute things, no bigger than 70 by 70 pixels - would be too much work otherwise. And then sell them as "GIFTS" on facebook for 1$ each! A couple of years ago I would have said that this is never going to work! I mean who would ever going to spend 1$ for a small little image which you can just copy from the screen??!! But these days it seems to work! I am still waiting for my brilliant idea though...
(image taken from the facebook gift shop)