Here is an image of the beginnings of an aquarium made from a light bulb.
It is built from a normal light bulb that has been butchered a bit to empty the innards out and put some small rocks/pebbles inside.
"The first test with a filled bulb was¦.horrifying. Apparently the pump is made for a much larger fishbowl (go figure). When I turned on the pump, bubbles violently filled the bulb with foam, and nearly all the water ended up on the basement floor. A knot in the tubing. It worked wonders, I wish I had a picture of the overly simplistic approach, but camera batteries only last so long."
More details over at Hacked Gadgets and Here.