I don't think I would be game, be sure you really really love it, maybe splash back only .. Just in case you tire of it..good luck, I would love to see photos if you choose to use it. Tiles are really difficult, swinging between ultra boring, tired the day they go in and something out there like what you are contemplating

Silk would be interesting, not to mention elegant. As for paints, the Silver Illusion appeals, but it might throw green (not sure). I also agree the Tranquil Retreat is a good one. I'm wondering how big the feature wall is, and what is going on this wall, eg TV, fireplace, large artwork, etc.?

wow I love all these suggestions. I was going to suggest a grasscloth wallpaper, because it has wonderful texture. But I'm quite taken with the shelves idea now.

I would have thought the intent of mosaic feature was to highlight a feature by drawing your attention to it. I assume the bath and window is intended to be a feature, so why not tile above bath & around window to draw attention to that.