The photo is to feature bench top and table by Timber Revival. Maybe contact them (Website, Facebook or on Houzz) to find out about tiles in the picture? They may be able to tell you, or find out from one of their clients. They really are beautiful tiles.

It can either look really dramatic or too dark, depending on the size of the room as well as your other components. I've attached a couple of images of our work using dark tiles, the smaller bathroom we have surrounded the bath with dark tiles but then balance it with an extra large mirror to bounce the light around the room. The larger bathroom we have taken the floor colour way onto the wall but used a different texture on the walls for drama. Hopefully this gives you more of an idea but you shouldn't to nervous of the room being dark, it's where you can create a contrast as well as textures. Look forward to seeing what you go with in the end.

Sorry to keep you waiting. Busy as crazy doing another bathroom in the house. Hopefully the last for a while. Yes it is paint behind the vanity. After much deliberation I went ahead and painted it. It is easily wiped down for any accidental splash back but unless your bathing in your washbasin there’s hardly ever any The floor tiles, and in fact all the tiles are from Moorabbin Tiles. Polished porcelain. Thank you for your kind feedback

Sounds like a very stressful situation! If there is absolutely no way the builder will allow you to change things (even if they did, I imagine they would ask you to foot the entire bill of pulling the tiles down and replacing all water proofing in addition to new tiles), I can make a few suggestions for improvement. Firstly I would suggest replacing the tiles above the vanity with a white mosaic, a patterned or a textured feature tile/strip. You could also use this same tile to replace the vertical feature in the shower. There are some beautiful shapes and sizes available to choose from. Secondly I would address the grout situation in this way: Floor - dark colour grout & Walls - Light colour grout. Lastly if it does not prove too difficult or expensive, maybe replace the tiles below the vanity with a plain white tile (could be similar size). Good luck and I am sure once you have a lovely mirror up and some crisp white towels, it will look just wonderful.