(EDIT: I'm not sure if I tagged it correctly, but you get the idea.)
Howdy,
So, as my first attempt at this kind of thing, I replaced the Ruins of Ahn'Qiraj with Kalidar, an old, unused zone from the WoW Alpha. It's basically three different sub-zones, which each, in my opinion, appear to be prototype versions of the battlegrounds that shipped with WoW. (AB, AV, WSG)
This isn't intended to be used in retail, of course, but it can provide some fun exploration or serve as a custom zone in a private server.
I DID NOT RETRIEVE THESE MAPS MYSELF. THEY WERE EXTRACTED BY MoD, I SIMPLY DOWNLOADED THEM FROM THIS THREAD AND THEN SWAPPED THE .ADTs AROUND A BIT.
Just put it in your "World of Warcraft/Data" folder to install.
".worldport 509 800 10 300", should port you inside the zone.
Anyhoo, here are some screenies.
~DOWNLOAD HERE.~
Once again, ALL CREDIT GOES TO MoD FOR EXTRACTING THE MAPS, I JUST SWAPPED THEM.