Kalm Town, Rocket Town, Corel Prison, Weapon Seller's House, Nibelheim, And Chocobo Sage's House all use the same 2 textures for their walls. The only problem with adding doors and windows to the textures is that the textures are applied differently in every location. So you get floating doors, windows cut in half, windows the size of the whole wall, and a bunch of other alignment issues. The reason I went with a simple texture is that the other texture with doors and windows made the game look stupid, unfinished, and trashy.