I really want to put some green leds inside my box fading in and out at a slow pace. i know its simple i have even seen some schematics but i still cant get it. can someone show me the light, FADING LIGHT! lol . thanks for the help!

SickDimension already thought of this
http://sickmods.net/index.php?site=Fader360-Install

You can get leds that fade from one colour to another and you can get ones that flash. I cant remember if i've seen ones that fade by themselves but i don't see why they wouldn't exist. try maplin (uk) or ebay or what not. i'm working on a circuit that will mean the leds will change brightness depending on how hot the xbox is, all possible just needs thinking about same as yours.