I don’t want to admit how long this ensuite has been like this, partly due to corona but mainly due to me not being able to make up my mind!
My original idea was to have a custom made reclaimed wood wash stand on the right hand side (with a mixer tap/single sit on basin), coloured tiles on floor and metro white tiles in the shower (back wall) and on the built in box housing the toilet/plumbing.
However we have 4.5m of marble hexagon tiles that couldn’t be used in a room I had bought them for so really I should using them! There’s enough to either just do the shower enclosure or the back wall of the shower and floor to ceiling behind the wash stand. I can’t really buy more of them as they don’t do the shiny version that I’ve got, only the matt version.
The other option is to take out the washstand and run the boxing to the end of the room, use the marble tiles and just have a normal sink on a pedestal. I guess then matching rectangle marble tiles for the shower enclosure?! The room is very narrow so I can’t run the boxing along and have a wash stand attached- which would have been an easy solution! 
I know I’m overthinking it and I’ve Pinterest-ed myself blind so any helpful ideas/design inspiration would be most welcome!!