This picture made it into a magazine…
I’m really not sure how, because I would have torn this shower out completely. Take a close look at the grout lines, and notice the size of the tiles.
There is no dependable (and reasonable) way to get a smooth cut on glass tile every time. If you plan to use glass tile, it’s ultra important to lay out your work exactly before you start so that it works out to exact measurements with no cuts at all.
Move a whole wall if you have to to avoid having cuts in your glass tile installation. It’s usually not a big deal to add a layer of cement board to a shower wall to get it to work out.
Tile backer boards such as “durock” or hardi-board come in a wide variety of thicknesses. Combining them can usually make the measurements right.
A glass tile job (I’m talking evenly shaped tiles like above) will look infinitely better if you follow this advice.
Believe me, I learned the hard way.