I was surfing around YouTube earlier and came across the following video:
http://www.youtube.com/watch?v=LubYMbtL23E
The design is very simple, yet quite effective at creating a "mood" for the tank. It honestly has to be my most favorite nano of all time. It would be great to take the same concept and add a little more to it (think of all the possibilities).
I've gotta find me one of those Buddha statues