I have found the following skins,
Ali Larter Skin,
Grunge,
Screamin Blue,
Slipknot-Dont Belong
Free
Grey-3dAmp
What im still looking for is,
Tairrie B Amp
Wa2 Metal
Purple Haze
I dont know if there is more than that or not LOL its has been such a long time.
here is pics of Tairrie B and Purple Haze
and the metal skin is like a dark lime green coloured LCD with gray metal borders, it looks really good and was prob my best skin! i might have a screenie with it on.