So I convinced my cousin to buy a small 5 gallon tank. We played around with some aquascaping, and came up with something that looks awesome. (Well I think it's a good start.)
Here's a crappy pic, I'll have really nice ones in a little bit.
Don't mind the cloudy water, and ugly blue silicon air line. We just mocked this up.
EDIT: The rocks hide a box filter in the back.