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As already mentioned, painting fans is do-able. However, I don't think you will get that great of a metal effect. The majority of the metallic paints out there are nothing like the real thing. Good luck though! Be sure to show us some pics if you are successful.
I think the aluminum housing fans will give you bettter results than the metalic colored painted ones. I wasnt impressed with the metalic paint I tried. IT actually turned into a disaster when I tried to polish it out.