This video tutorial goes through the steps to create a tile material from scratch within VRay for Rhino. The key steps in this video can be seen below:
0:27 - Creating a new 'generic material'
0:52 - Adding a 'VRay Tile Map' to the material
1:32 - Applying the material to an object
1:59 - Texture mapping the object
2:50 - Editing the tile material's visual properties
4:56 - Adding an image texture to the tiles for additional texture
7:00 - Adding a bump map to create an uneven surface to the tiles
9:16 - Adding a reflection to the tile material
9:55 - Aligning the texture with the geometry