vanillaWouldn't it just be waaaaay easier to throw up some decals around the map on the billboards and around the points and stuff? Then you wouldn't have to coordinate skins, it'd be easier to make, and you'd only have them on the side that whatever team is being sponsored, is defending (i.e. if AG is on red, then there will be AG advertising around their side of mid).
That'd require something to switch the logos around at the half. Over at eXtv we've got a set of logos that replaces ingame signs with eXtv and EOR logos (and Extine's sideburns) all over the place. But in that case you could only splatter the sponsors in a random pattern.