Jason Dietz makes what he calls UFO Abduction Lamps. They look like flying saucers projecting eerie lights onto the ground below. Here's how they're made:
They stand 5-feet 5-inches tall and are made out of recycled glass tubes, light diffusers, and acrylic rings. They hold approximately 10 gallons of water each. They use a series of different lights that include CFLs, LEDs, and halogens. They each have a 110-volt 20-gallon air pump that produces the bubbles from the bottom. The theme is a cow being abducted out of a grassy pasture -- look carefully to see the cow in the giant plasma tube.
Link via Technabob