I'd go with AnOldFriend's imperial house textures, they're better than connary's imo, but I'm more into the darker 'grungy' look.
http://www.gamesas.com/bgsforums/index.php?showtopic=1051884&st=0&start=0
they are very good but i use them only for the bitter coast, because i think caldera isn't that grungy
(but i also have two different replacer for balmora and suran, so this is my thing going on haha). there are several replacer for these houses, mr.swiveller had some good ones and i got some textures from somebody who has made even grungier texes than aof but i can't remember the name^^