For a modern look, use Schluter's Jolly trim to cap the edge of the tile. Coordinate with the other metals in the room and make sure to compare the thickness of the tile to the trim so that it fully covers the edge without hanging over. The L-shaped Jolly trim has a perforated flange that gets set in the thinset before laying the tile — no fasteners are necessary.
like the subway tile (should I do it like this or offset?) and I like the stripe of color to offset just the white... maybe consider a gray line through the shower (way to get glass look without having to do the whole shower in glass.