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.

I am just wondering whether it is a good thing or not to go with solid colours like the dark blue (prussian blue), grey floors and white on other walls all in tiles. I see that a lot of designers seem to do a pattern on one wall, but I haven't found one suitable and whatever I do, I just don't want it to look out of date in 5 years time. I am not sure how about much of the prussian blue tile is appropriate in order for it to be noticeable but not too overpowering.

The size of floor tile: 300 x 300 mm and the size of wall tile: 300 x 600mm The floor tile and wall tile do not align at all. It looks unprofessional. Should the tiler redo the job? Thanks for your advice.

So I have decided against doing a feature wall on wall running alongside shower as it will make the room too dark. Instead the feature tiles will be on the wall behind the shower mixer. I am now in a quandry re the vanity wall. The floor will be light grey concrete style tiles, walls satin white and the ceiling is a raked ceiling made from baltic pine which over time has gone orangey tone. Do I get a plane white vanity, charred oak timber look (grey), another timber tone? I have decided on 1200 mm wall hung vanity but need help on colour and whether or not I put a mirrored cabinet on wall above vanity also. I originally had decided against any cabinetry above the vanity.