We are selecting finishes for our master ensuite and found a wonderful tile called New Byzantine Azzuro (see photo). We are planning to have a Carrara marble vanity top and would like to use this tile on the floor and the walls of a frameless glass shower. We're just afraid it will look like too much. The tile comes in 13X13, 12X24, and 17.7X17.7. Do you think we should use different sizes on the floors and walls to break things up? If so, what sizes where?