This is some kind of a master file for creating tileable brick textures from high poly geometry. Just bake maps (like normals, ao, height) to the selected plane and use these for your textures.
There are 5 individual bricks, copied and rotated several times for good variation. Feel free to change the arrangement and therefore set up different textures.
This is my final result with parallax mapping and some fake self-shadowing in UDK: http://www.abload.de/img/iparallax_01_4iplxsskjs3g.jpg
I made a few those (e.g. roof shingles, wooden planks, cobble stone) but decided to keep them in separate files due to filesize and performance.
This blend file requires a fairly powerful computer. I did set the subdivision level to 2 for all bricks which results in ~4-5GB memory usage when baking maps; at level 3 this would be ~15GB. For better viewport navigation switch to wireframe mode.