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. Click through for more ideas.
Match to futuristic/space Traveller ooh. this would be a super fun project. color-match spectrum of a favorite photo. even more so if the spectrum was also collaged from photos, not just color matched on illustrator.