Adorno said:
It's the Polished Landscapes mod - but it's not working perfectly:
http://forums.taleworlds.com/index.php/topic,87617.0.html
I wish I knew that was compatible with warband, and now that I think of it I don't know why I would think it wouldn't be
of course if it had a thread in the Caravanserai, I would have seen it and got to experience a better looking warband