Is this having to do with your tank camo netting you discussed earlier? The buildings will be a stucco look with, as mark said, earthly colors. The buildings overall color tends to be a light to medium grey or a brick red (but not actual brick). They window sills and door frames are usually just a darker shade of grey for grey buildings or a lighter black for the red. The only wood you would probably see would be in the actually window panes or the door. To detail, dry brush dust everywhere. There was an article in FSM, I'll check later or tomorrow, that actually describes building a diorama base and has very good tips on inexpensive ways to construct and detail a town.