This set has seamless 5x5 tiles of tumbled bricks in four shades. Not only is the border seamless, but each actual tile is as well, meaning you can rotate single tiles (EP permitting) anywhere you want to remove any sense of repetition.
Another set of 5x5 floors, this time stone tiles. Each tiles in the 5x5 grid is different, so if you have the right EP you should be able to rotate any individual tile you want to create even more randomness in large spaces. The last two files, almost black and dark grey variance, are not pictured.