Who's been sniffing paint fumes?
I recall once reading that AA aircraft, by not having paint, save about $250,000 per year per aircraft (less fuel burn carrying that extra weight, less MX to repaint, etc)
Oh, and the reason allot of wings look grey is b/c they have oxidzied some (just like AA aircraft, some look dull grey-ish b/c they haven't been polished recently. I think leading edges are sortta' 'polished' by the microscopic crud that constantly batters them, and of course they don't get painted due to the anti-ice issues). I wonder if the wings flight controls (ailerons) have to be pre-painted in production to properly balance them (like rudders have to be hung pre-painted at the Boeing factory)
So, as long as we're talking paint - when they painted the Concorde in the Pepsi paint scheme, they actually had to fly at less than mach 2 b/c the aircraft skin would heat up too much due to the dark blue 'colour'
As far as the 'see and be seen' concept goes, I don't think they could have picked two worse colors than light blue and white, but I don't think a pilot picked those as much as a hired-gun marketing guru.