Well, you might need to find that texture inside the warcraft machine. Well, get an MPQ editor, like WinMPQ and find your texture. It's path will not be that hard to find, since you can see the texture through the Object Editor, get a building and go to Art - Ground Texture. Open the MPQ editor, get the texture, edit it in your photoshop -i guess- and re-import it Some of the paths are displayed on the Pathing - Pathing Map, but not all. Anyway, on each model there will be its textures as well, so.. Just get the Editor.
Finally finding about some of the bots that are flooding the users online - bytespider apparently is a huge offender here - ignores robots.txt and comes in from a ton of different IPs
Ghan has said he has fixed this. Monovertex please confirm this fix. This was only a problem with people that had signatures in the upper levels like not the special members but the respected members.