Lewis - looks nice, but is a bit too dark and missing the bluish tinge i'd expect in 'aluminum'.
I've not much to offer, i used to have craploads of such things, but all i've found is this small, tileable image:
(i've another image from a metal txture cd, but i'm not sure if i can manage the necessary photoshopping. playing with it now..)
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- + - ° GiRLie GeeK ° - + - °
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Therell be days/When Ill stray/I may appear to be/Constantly out of reach/I give in to sin/Because I like to practise what I preach