Thanks for your questions. 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. Although the colours are similar to travertine, it's a more superior stone and can be used in both domestic and commercial projects. This project was in the UK, so not sure whereabouts you are? These were purchased from Devon Stone but any good stone company will either stock it or at least source it for you.

Thanks so much for this information

You're welcome and all the best with your bathroom renovation. Would love to see the finished result.