Seriously, you must be trolling or something. Seeing black helicopters around corners?
This facetious argument has been brought up time and time again by the same small group of people.
It's a NON issue.
The default skin is NOT tied to the terrain, nor should it be. Nor would 1 terrain ALL be the same color (fighting at 1 base would have different ground tiles than fighting at another base on the same map).
You're complaining over something as a possible excuse for why you keep getting killed, is the only thing I can think of, otherwise you would never bring the issue up.
It's NOT a conspiracy. It's NOT out to get you. The default skin is the only one you'd have without the time and efforts of the folks that make the "custom" skins. You might appreciate them more if you weren't allowed to have any for a while. The only (repeat: ONLY) reason the "disable skins" option is there is to ease system problems on slower/weaker PCs, and you need to be careful of the impact your blind blanket request would have to a LOT of AH players.
P.S. Just ask for GV icons. End of story.