Running through a list of news stories from my beat, I came up to this one site that has a list (with images) of at least 15 gameboys that were either modded or an actual retail version. Most of these I already knew about, like the Pokemon and the Hello Kitty versions and others I have never seen before. Like the Game Boy Light, which was essentially, a Game Boy Pocket that had a screen with a backlight. Apparently it was only sold in Japan. Weird that I never heard of it before. Anyway you should really check it out, you would be surprised at what systems you have never heard about.