Painting could you possibly spray paint the fans of this card white? And would it be wise to even paint them?

I don't have any hands on experience with this exact card but I would caution against painting fans in general.  Even a light coating of paint can add strain to the card and significantly shorten its life.  The fan blades also are very delicately balanced. If the coat of paint is uneven you can wear out your fan bearings in a hurry.