Mosaic Sicis SiciStone Olson Gray. The size of the die for repeating is 426 mm x 426 mm. The material is done using CoronaMultiMap (VrayMultiSubTex) and assigned to objects by the MaterialByElement modifier, so you can easily fill any area with tiles in a random order.

"Who works in the V-Ray version is lower than 3.1, please be careful, the materials in the BRDF section are Microfaset GTR (GGX), if your version is older than 3.1, then the BRDF field will be empty. Choose Blinn, Phong or Ward - which is preferable for you. "If the version of CORONA is higher than 1.4:" For Corona render, it is recommended to install version 1.5 or higher, since the glossiness of materials is adjusted to PBR. "