Although Sarah's looks more taupe in this photo, check out "Golden Gate Stack Stone."

I had wondered if it might be Falling Water slate(I had seen that tile on this forum months ago). I do like Falling Water,(though I've never seen in it person, only in photos.) However, I believe that the stones in Falling water are only either 1" or 3/4" high, and the ones in the "mystery photo" appear to have some larger ones in there. I would like some larger ones like that. Maybe I could call the company to be sure. epressler--thanks so much for the link. I followed it, and fortunately, the photo had a tag (hover over with the mouse) giving the name of the supplier and of the stone!! How cool is that (don't you wish all those design photos did that!)So I googled, and I will put the link below to the tile supplier, Statements Tile, for anyone else who might be interested. I think I may email the mystery photo to both those tile companies and just ask if it could be there stone! Gigi- the photo came from Boxerpups' collection of design photos--as far as I can tell from her photo bucket album, there is no info from where it came! Newchapter--I wondered about limestone,too. I will check into it. Thanks eveyone, again. Here is a link that might be useful: Statements tile- Golden Gate Tumbled quartzitie

Several years ago (maybe around 2013-2014) someone posted their "Scandinavian inspired" kitchen with similar multicolored tiled walls -- loved it, can't find it now, unfortunately.

Here is a link to another view of the same kitchen The listing simply mentions that it is Carrera marble inlay mosaic