I don't see the point, just like T.V. How long do you really spend in there anyway. Maybe once in a blue moon it would be nice but really? To be perfectly honest I don't understand the fascination with the huge bathrooms that need hours to clean, I would rather save that square footage and use it for something I would actually need like a bigger walk-in closet for instance. I live in MCM house we have 3 bathrooms all small and I love them. They are easy to clean look great and what we have are nice big rooms that actually function well.

Photos would help us a lot but mint and grey usually goes well with charred oak.

That would be pretty. Take some floor tileto the paint store and then bring home small samples, or since it probably won't take more than a quart, if you aren't crazy about your first choice repaint.

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