Ceramic Tiles_small square
It's the Ceramic Tiles_small square texture created in the Filter Forge plugin. It can be seamless tiled and rendered in any resolution without loosing details.
You can see the presets and download this texture for free on the Filter Forge site here — www.filterforge.com/filters/559.html (created by Bongo51)
To use this texture download Filter Forge 30-day trial version for free here — www.filterforge.com/download/