As promised, I have created a tutorial which will get some variation in your scenes very quickly, model different types of matrix/timber cladding, tiles, bricks and easily adjust them based on the revisions - this includes walls and ceilings. There is also a quick run down on vray3 render settings - this will always be different per project but a good base for your highres.
Rayfire, Multitexture & Render Settings
Rayfire, Multitexture & Render Settings
