I really like the tiled floor, and especially like the randomly-tiled shower stall... If you think like I do, and would like to see a few splashes of a brighter color, there are plenty of ideas at http://www.bathroom-paint.net/bathroom-paint-color.php
A house we are considering as open tiled showers similar to this. The tile is brown (not gray) and it (thankfully) has no window right there at the shower! I love the idea of an open tiled shower! No glass to keep clean, no curtain driving you crazy!