You can check if they make the same terracotta pattern for walls. Especially when it's a small bath, not having too many changes in material will make it feel larger. Here's an inspiration image.

Try 14" travertine tiles in shower, With a chocolate/white, glass tile border.

Can you post some pictures so we know more of what your looking at? Also is the overall shower needing replacement for some reason, or just the shower pan. I know I have a tiled shower and they replaced just the pan and a few bottom rows of tile which worked out okay (I didn't do the replacement, it was done by a previous owner). And if it's just a grout issue you could look into regrouting. Of course then again if tiles are falling off the walls sometimes you have no choice but to replace!