MY attempt of making A seamless Tilable texture for stone floors. I made a minor error in making them seamless as there seems to be a very small seam on the X axis. the texure tiles really well still though and is very much usable.

Painted in Blender, edited for fine detail in GIMP.

Includes Diffuse Normal and specularity

Preview is renderd in blender cycles using a sun lamp and eviroment lighting.

Preview render is the texture tiled once each direction.