brown is another 'neutral' color that works with black and white scheme. Would be helpful if you can provide photos or links to the samples you have chosen.

We have a 900x900 shower and it's plenty big enough. Neither of your proposed layouts looks that great, to be perfectly honest, sorry! In the first layout, you could improve it quite a lot by swapping the toilet and vanity (centre the toilet under the window on the bottom right of the picture if possible), and having the shower door on the other wall (beside the door). Then, you could have a towel rail on the wall beside the door (i.e. behind the door when it's open), which would be accessible from the shower but hidden when the door was open. An 800x1200 shower might be a good size for your space. You'd have to choose a toilet that doesn't protrude too far, plus a narrow vanity. With that layout, you could have a long but narrow wall-hung vanity, with a big mirror covering the wall between the windows, which would make the room feel bigger and would give a good amount of storage. Also, you may find this helpful: http://www.houseplanshelper.com/small-bathroom-floor-plans.html?utm_content=buffer4aa20&utm_medium=social&utm_source=facebook.com&utm_campaign=buffer

This project required a small renovation, where my clients wanted to create something simple and light, without costing a fortune. In the guest bathroom we were able to leave the plumbing as is and worked on replacing the WC, Shower and Vanity. In the laundry the area in the room behind the counter, storage area was pushed back allowing for a larger space within the narrow room. A new door was put in and a new window. Before: After: This extension of space allowed for the guest bathroom to be extended out as well to allow for a larger vanity and all round larger and more accommodating space. The counter top in the laundry is bamboo, the simple black tiles above and perhaps later down the clients will put up cupboards and shelving as suggested. Before: After: The light grey ceramic tiles on the floor replaced the dark ones that made the space feel small and cramped. The white on the walls and new lighting give a totally different feel to the room and makes it a far more welcoming space to work in. Check entire project here!

I wouldn't do skirtings . I'd do the floor tile for '1 tile' up the wall ( assume they are 200 x 200 or 300 x 300 -- cut them if 400 or 600 ) . Personally , I'd probably even do the 'silver' tiled areas in that 1 height darker tile too , as it would make the whole room look more 'level' , but thats up to you and your tiler .