One final note. You can do this with 3D objects too. I originally developed this photo technique from adapting it from a 3D object tutorial on the web somewhere. You can create a pavement by creating paved tiles as 3D objects then taking the right hand side paving stones of a patch and placing them on the left and vice versa and then also for the top and bottom then slice the 3D object in a square cutting the edge paving slabs into halves and then your 3D bit of paving can be tiled.

End of tutorial - any questions or comments ?