I could make a tutorial, would have to be with limited pics though (might get round to this)
The spray paint is kinda plastic based, and its had a few coats, as long as I look after it I should be ok in terms of getting marked, etc. I was gonna put a switch on to turn the lights on and off, but didnt. I may do this at a later date, as they are really bright. Having said that you get used to them after a while, and I find my thumbs are poised over both buttons a lot, which cuts out the light.
The paint makes a REALLY nice finish though.
Would I consider modding other peoples? Hmm, I did think about this, tbh you'd be better off doing it yourself. Disassembling the GP32 to spray it is easy enough. The LED's just run off the contacts that were used to power the FLU, so each LED gets 3.3v. A hole was cut into the sides of the buttons on the membrane(s), and the LED pushed in.
I wouldn't wanna break someones GP32 by dropping it or something. The LED's are really cheap, and the paint is only £5 per can iirc. (1 can covers 2meter squared I think). Check out:
http://www.plastikote.com/plastikote/splash/index.jsp
I used one of the plastic adhearing sprays, black + silver enamel versions. There are other plastic adhearing ones that'd work too.
I'm yet to find out how much battery life will be shortened by the LED's, they are both ~30mA drain
[EDIT] will post some more pics later, it looks cool in the dark