I chose tile wallpaper from my favourite printie site, and I photocopied black-and-white chequered floor that I had used for Helen Hall that is now gone, so it's ok to use the same pattern. After Helen Hall where I could easily dismantle the walls and put in wallpaper before I assembled them again, here I had to work in awkward spaces. But I am very pleased with the result. The toilet and the washbasin are from ebay (cheap, for the toilet seat and one tap are missing), and the mirror is from a Barbie house and had been used elsewhere all this time.
Of course I must put in a wall and a door (with a sign), and of course there will be more details: a towel rack, a shelf, a potted plant. So please come back soon.