the anolog has been done before you just got to find it
the triangle x o square buttons, all you have to do is repaint the originals, thats not too difficult
the 5 stages of lights you would probably have to go in and rewire the internal back lights on a switch you can control elsewhere on the system(i dont really see a point to this one btw)
the gameboy color games playable you can do, but you would have to download the software to convert the gameboy color games to game boy advance, and then get a slot 2 device to load them onto