Perhaps this has already been mentioned, but was thinking, it would be really cool to have an aquarium dream based on the Windows XP screen saver that you could buy.  Little fish swimming around on your desktop, with a few choices in sceenery and coral.  maybe even a switch between night and day depending on the time.  Just a thought.  Of course, I think it would have to be dynamic because of the comlex nature of such a dream, but I would actually glady shell out money for it without complaining!!!