Okay, here is what I have come up with as far as "greyish" bricks, I like this more than the colored ones, there is no color map, only a bump. I know I over-did it on the paper on the ground, will re-touch that later. The main problem I'm having is getting transparencies to render correctly with mental ray. I brought some images through the connection editor, Out Alpha-->Transparency RGB, And I inverted the alpha colors. Maya renderer renders my transparency maps correctly, however, mental ray does not seem to respond to the transparency settings as well. How can I go about adding smears of dirt, paint, etc... on the brick wall? Can paint effects let me do this? anyways... back to work =)