Bathstore are solely for the shower trays, bath and tapware. www.bathstore.com. The floor tiles are the same colour as the wall tiles, it's just the light coming through the window that shows the different variants of the stone. It is Perlato Olympo Limstone. This project was in the UK, so not sure whereabouts you are? These were purchased from Devon Stone (http://devonstone.com) but any good stone company will either stock it or at least source it for you.
Thank you so much for your speedy reply! Great info. Wish all Houzz designers were as responsive as you:)
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