Okay, the method I normally use to create marble floor/block is to use the blender node, controlled by cellular node, and fed by the 2 marble tile textures in differnt scales. (I forgot who wrote this tutorial at runtimedna, but thank you very much)

Anyways, I am just trying to see what different methods others use to create repeating tiles that are not uniform. I read that tile node allows to do this alot easier, but how would I go about setting this up? And once I get the desired effect, let's say it's a marble floor, what else could I do in the materials room to make it more realistic?