Seeing how people are starting to dig up that iconic Power Mac G4 cube and reuse them for all sorts of personal pleasures, we believe a roundup is in order. Here's a few things you can do with that amazing acrylic box in case it blows up (or has already blown up, taking up room in your closet).
Turn it into a tissue box.
Turn it into an aquarium.
Use it to hold your Mac Mini, external hard drives, and Airport Extreme.
Turn it into a custom computer with built-in LCD.
Turn it into a modern hanging lamp. The above picture is actually the Ice Cube Lamp, but it looks almost exactly like the G4 cube hanging from a wire - a simple DIY should do the trick.