It'd look like a mountain cabin. And it'd look lovely when it's clean, but it'd be difficult to keep that way. If I were going to use stacked stone in a shower, I'd do the following to make it practical as possible:

- Consider using it on only an accent wall ... this will help with both cost and cleaning. Make the other walls simple white /off-white large-scale tiles that will be a snap to keep clean.

- Allow space above the glass doors (I assume you're using glass doors ... no one would put in an expensive /hard to clean item, then cover it up with a shower curtain) for steam to escape. AND put an exhaust fan IN the shower. This will help prevent water "standing" on all those little ledges /will cut down on growth of mold.

IMO stacked stone is beautiful. Use it for a fireplace surround or somewhere else that is more suited to that material. A smooth surface is needed for a shower. People are always posting threads on here complaining that their tile professional created lippages in their shower. If you use a stacked stone you are automatically going to have all these little nooks and crannies. That is going to be virtually impossible to keep clean.

Why don’t you use the Stackstone somewhere else and pull a nice color out of it and put a nice smooth porcelain tile in the shower that has some of the colors from the Stackstone that’s in another room. That’ll help you tie together colors throughout your house without introducing an impossible to clean surface.

My daughter is a professional composer, producer, and arranger. There’s a vocabulary word called idiomatic that composers learn on day one, mine learned it at age 9. It basically means to assign the work in music to instruments that can do it. So you wouldn’t assign a violinist to play bass notes that are only achievable on a cello. There’s no way the violinist can play those notes. So if you are a composer and you try to write those notes into the violin part, you’re not composing in an appropriate idiomatic fashion. This principle applies to putting building materials in places where they don’t belong. The inappropriate materials are not idiomatically aligned with the functions of the space.

Since shower, toilets, bathtubs, and sinks, should be pretty much the most cleanable surfaces in your house, you should choose smooth surfaces for those. Stack stone is not idiomatically aligned with the function of the shower.

Now, People do violate this basic principle all the time, for example carpet in bathrooms, yuck. So if you want to violate this basic principle, it’s your house, and you can do it. I’m sure you will find a contractor that would be willing to do it. Just like all those people found contractors that were willing to install carpet in their bathrooms.

Do you enjoy scrubbing out the dead skin cells, and soap, and hair, and mold, out of the cracks and texture? If do, this will keep you busy as a dream.

Take a sheet of that stone and rub it against your bare skin. That will be your answer. FWIW we try to talk every customer out of using natural stone in a shower as it acts like a sponge, soaking up water and looking terrible.