Base coat
Rust texture added with three colors using a crusty rag. Added a brown wash on top.
Detail
Started with plain cardboard bricks. Based on three different colors using a roller and basing the grout color. Then added a wash on top using a chip brush to fill in the spaces without paint. Next, the designers wanted the top and bottom to be "dirty," so an almost black was added to those areas with a chip brush. Finally, I added a highlight to the protruding parts of the brick with a chip brush.
Detail