I found some cool diamond patterns, but nothing quite like the black and white example you provided: Also, while searching I found this totally awesome concept: Were you able to find a wallpaper like the one you provided?

No suggestions here apart from getting the wallpaper you want either shipped to you or searching around for it!

We make self-adhesive fabric wallpaper that is great for feature walls - and you can install it yourself! :)

Yes, I had noticed a lot of pics on Houzz, that's what gave me the idea! I certainly wouldn't put it IN the shower! We have a tiled shower, but the tiles only go as high as the glass surrounds, so there is about 30cm of painted wall above the shower, which is the part I was worried about with steam etc.