An example of one of the many 3d total textures which I used to make this scene look more natural
Used for the depot wall
Here are some shots of the textured scene objects:
First tiles test render
I've created one standard material and made 2 copies from it but with the different hue to add some variety. To add more variety to the tiles, I've drawn the dirt mask for the whole roof and assigned different map channel to it. This dirt mask serves as a mask for the MIX map in the tile material(diffuse, specular and bump).