Redittor lava_lump has this great homemade aquarium:
As he says, the project went “swimmingly”. Not counting the aquarium equipment, the hardware costs were for high tension cabling and silicone and LED lighting, which cost him $125. The cost for the aquarium equipment was $220. Not bad at all, and the broken washing machine was only worth about 50 bucks. And since you can’t just have regular old fish in a cool aquarium like this, he bought some “glo fish” to go with that LED lighting.