cold cathode fluorescent light
it's not very hard. most cold cathode kits for computers come witih 12v inverters. the car's power running to most things, like interior lights and the cigarette lighter are 12v, so all you have to do is find one you want to use, and tap into it. you'll have to figure out when you want them to come on, of course. the cig lighter will be always on when the key is turned, i think (at least in the 5th gen it is), so that's a good option. you might want to find a way to mount a switch to turn them on or off, too. mine are exactly like that.