Personally, I'd go for something identical to the wall tiles - just a plain tile, as the floor tile you chose is very strong visually on a large scale. Or same as the floor tile, but I'd be worried on the overall effect. http://www.villalagoontile.com/cubes-design-cement-tile.html Or you could have the shower tile custom made: http://www.mosaic-color.com/simulateur.php?lg=an Good luck!

Thank you!

These are the tile samples I have so far. On the left - small top dark grey, under that is a tile with faux stepped marble effect tiles that are more slate toned. Large tile to the right is the mandarin stone one (v expensive, lol) The walnut in the middle I love the pattern but it’s not as rich a colour as I wanted and I can’t find anything else online in an American walnut style tile. The bottom tile is a v v pale grey with similar pattern to the mandarin stone one. How would you work these tiles together? Walnut floor and sink unit and dark grey all over the walls? Just the patterned grey on the back of the shower wall and sink area and plain grey on other walls?? :0/

Thanks for all your comments. I have gone with an unfinished edge like Rukmini's pictures (sorry Sonia :D) as I think it will just look a bit more interesting especially against a dark navy wall. I have tiled around the window but not into the window recess. I'm pleased with how it looks so far - will try to remember to post a pic of the finished room!