These are the tiling materials I have created in my free time in order to practice. All adhere to a current generation PBR workflow. The base photos for images 1,2, 3, 9 and 10 were courtesy of Joost Textures, the rest were taken by myself.
Rendered in Marmoset Toolbag 2. I used Knald for base normal and height maps (which were tweaked), and Substance Designer for automating much of my tiling and lighting cancellation.