See that Modware - Windowed Side Panel and Mod Kit
over in the corner? We bought that a few years ago in the heyday of the PC case modding fad and never used it. Time to wipe the dust off. Take out the 12" Neon Cold Cathode Light Kit and the Case Cutting Tool, throw the rest away. The cathode kit includes the light tube itself and a voltage converter (black box thingy). We won't be using the cutting tool in this project but you never know when you'll need some crappy tin snips.
Rummage through your junk box/drawer/closet/basement and find a suitable AC adapter. We'll go into how to pick the right adapter a little later.
Also in said junk, find a transistor, a potentiometer, resistors, and a photoresistor. Don't get too caught up in the values, I have a feeling we'll be replacing these with Radio Shack parts soon anyway.