Just a minute ago, i was looking thru the level files for any .tifs that would come in handy for my new map. I stroll into boarding action and see this wierd one.
My guess is that it's one of the texture artist's wife or girlfriend. There was probably some extra texture space and rather than leave it just black the artist slipped that in instead.
the fact that it's still in there in CE, and is also in the texture in the xbox map, is pretty strange... or at least surprising that gearbox didn't replace it with black space....