Rose-
How about the shelving you see in hotels for towels? The chrome open shelf, with a towel bar on the bottom?
You could install this high up on a wall; (so heads aren't banging into it) maybe the wall that has the horizontal grab bar. Even if it is too tall for you, you can use one of those
"pincher/grabby thing-y" to pull a towel down. And, the towels would be handy for coming out of the shower.
I know I have seen them in catalogues; perhaps you could even find online at bathroom stores (Bed, Bath & Beyond?) An alternative would be to check a home improvement store (again, online tends to have more of a selection). There are so many organizational things available now- it would just depend on the look (and maybe the pocketbook!)
Also, check the container store online.