I created a tileable texture for the kitchen floor. The texture was taken as a picture on my iphone and then aligned in photoshop. For the spec/bump map I just used the "Select > Color Range" to select the lighter values in the image. I used marquee select and filled the little grout sections in between with 50% gray. I used a blinn material with the b&w texture on the right for the spec and added a low bump value. I wanted the sheen to show some detail when the light hits, so I lowered the eccentricity on the specular channel so it wasn't over exposed with the physical sun and sky and voilà.