It's not really a skin mate. If this was done using MS Paint, I'd consider better software. I recommend GIMP (
www.gimp.org) as it is free, and doesn't have so many tools to confuse you. Then go to Masterskinnerz, and download a pro kit. You should be able to have a play around with those .psd's and read a few tutorials. Ask for help if needed, there's plenty of graphics genius' floating around here.