This is a great look, but make no mistake, it will require continuous dusting, especially in an area next to a shower. It may become moist and drip if you don't have a good fan and allow the room to fill with steam at all; this will make the dust and dirt cling to the top of each piece.
This being said, using a stone that matches or a faux-stone porcelain would be great on the floor. Cutting that same floor porcelain or stone in smaller pieces for the shower floor would keep the flow working into the shower, helping to keep that zen feeling. Using the infinity drain in the shower, you would even be able to use the same tile as on the floor and really create a clean look.
A colored galss tile that is large or small, not the same size horizontal as the stone on this wall, would be best in my opinion for the shower walls and ceiling if you want to use glass.
Using only two materials would be great with this look... wall and tile color can come in the way of a beautiful terracotta, light olive green or steel grey; all would look great with this stone.