ah i also see what you ment about the light areas now that im looking at it with a fresh pair of eyes. it does kinda look like i've just overlayed a texture onto the image.

edit: the lighter and darker areas arnt dirt by the way its just different colours within the clan of the bricks, for instance maybe where its got slightly burnt while firing or soot from the kiln. if you look at most bricks they are a mixture of 3 common colours. with light main colour slightly darker colour for areas that were over heated/sooty and then the burnt colour

Edit2: ok i mushed up the bricks... dunno if its to much tho but i agree it looks better =) left the straight brick version up aswell



ingame (texture scaled to 0.5)