A not at all exhaustive collection of cool bizarro aquariums.

Modular fish tank

Toilet tank. Kind of like fish purgatory.

The Fish-Bird Tank-Cage
many more below the fold…

Sink tank

The sophisticated ichthyologist’s sitting room

A concept piece by a Japanese architectural firm
More of the above

This robotic fish tank senses which direction the fish is swimming and drives off in that direction. Could prove extremely useful in absolutely no circumstances.

In this Korean tank, the pump and aerator are powered via USB. Additionally, temperature is controlled via software on your computer and a video feed of your fish doing their thing is streamed on your monitor.

Turning your expensive Mac into a home for $.50 goldfish is a very popular hobby. See more below.

Mac Classic Tank

Insertz nauseating LOLZ here.

PC Tank – Hard to clean, impossible to customize and frequently crashes killing all fish and requiring you to buy new ones OR insert your own mildly-clever Windows joke here. Many more computer tanks here and here.

At first I was going to call this fish hell… but if they are schooling fish, maybe this is like constant bliss.

Car tank at the London Aquarium
Multi-level fish tank
CD player fish tank
A quick hat tip to Cephalopodcast you apparently did something like this a year ago.