What exactly are your options in this area, especially if you don’t want the steam & shower pods that stand out like a sore thumb, not sure who designs them but I’m guessing they are mainly for the retro fit market.
If your going to the expense of choosing tiles, and bathroom furniture the last thing you want is to be looking at a ‘Tardis’ especially and were considered to be a nation of showerers, and a fair percentage choosing interior designers to assist with the choice of tiling schemes, incidentally if your in the northwest Casaceramica in Manchester showcase large format tiles suitable for all steam cubicles.
We all love our German showers in the UK such as Hansgrohe, Dornbracht, Grohe & Keuco just to mention a few, but the options to use these products in a steam pod is nil, but not now, for example the Kahuri Shower Cubicle ( above ) looks like a contemporary shower cubicle, but add the roof specifically designed for the Kahuri series ( below ) and you have a steam proof bathing environment.
I have attended bathroom & shower trade shows in Italy, who incidentally created the steam showering principle, on the search for traditional format shower cubicles that are suitable for steam, and found them, and an incredible steam generator from Glass1989
This stand alone Steam Generator from www.glass1989.com cuts down steam installation by almost two thirds the time, compared with standard steam generators that have to be installed outside the room generally, this Noor steam module only need a power feed & cold water supply which is a first fix requirement on the same system as the cold water feed to the shower.