maybe use the same wood, but rotate it in some places so the beams go horizontally instead of vertically?
Yea, I thought I said this (but I guess I didn't)... rotating textures would be good...
You could also use other things to break up the textures, i.e: The paint patches, signs, posters, support beams, foliage, saws, pipes, windows, etc. You could/should add gutters to your roofs.
Look at how Upward, Sawmill, Thundermtn, Viaduct (kinda) all deal with wood textures, that will help. You will probably see a lot of what I've mentioned...
... Perhaps it wouldn't hurt to do a quick normal compile with all the bells and whistles, to get a better idea of what it will look like. It's better to not spend all your time doing detailing based of fast crappy compiles and then have it look like blah on a normal compile.
EDIT: Looking back at your picture I realize you already have a lot of those things... In that case, look into overlays and the paint brushed patch, and such. You could also use the dripping rust overlay. It's a brownish color, but it will add some diversity to your design.