Want a Gunmetal Gray PS3? All you need is a can of Spray Paint!
Dieselstation, a member of the Official PlayStation Forums has done a good job creating his own gun metal gray PS3.
He used a can of Tamiya Gunmetal TS-38 spray paint and used Testors Dullcote 1260 for the flat clear.
Check out a pic of it below, and more linked above.
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Hmm, looks good. Hopefully he can do the controllers next, I wouldn't change one without the other.