Classic Apple products have been repurposed into everything from clocks to iPad docks. Jake Harms’ version of the Mac de-evolution is Macquarium ($199), which is exactly what it sounds like: a fully functionting aquarium made out of a G3 iMac, complete with a built-in filter and lights.
Harms acquires the computers from local recyclers. After sprucing them up and taking out all of the electronic guts, he installs a three and a half gallon tank, suitable for keeping one to three fish. Right now you can get blue, aqua, white, smoke, red, Flower Power, and Blue Dalmatian patterns. If you have your own slot-loading G3 lying around, he also sells do-it-yourself conversion kits for $135. The kit includes the custom tank, a filter, a three foot rope light, light switch, six foot power cord, tank mounting hardware, and wire ties; you supply the tools.