The backsplash is Carrara Marble tiles. i believe they are 2" x 3" but other sizes are available.

They have most definitely selected the whitest possible Carrara. Which is the right thing to go with this design. In fact most people want a whiter based Carrara. It is the most sought after and hardest to come by. Attached are a few pictures of our products. In the kitchen, this customer used our Venato 3x6" Subway Tile ($7.00 square foot): http://www.thebuilderdepot.com/cama3xsuti.html

Also other options can be 1x3" mosaic, installed in brick stacked as it comes or cut into strips and staggered. Also 4x8" is always a good option. Then the 3x6" pictured in our warehouse (taken with iPhone).

The trick is the lighter base which is so hard to come by, unless we have it in stock online.

We also have carrera at glasstilestore.com if you are interested