Dont be afraid to inject personality into a shower wall design. This glass block wall (which is still in the process of being finished) used multiple glass block patterns to create a mosaic beveled glass type of look.
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!