I posted an earlier site for painting designs on your walls, but this seems a bit easier. Especially if you aren’t as artistic as you would like.
Amazon.com: Duo Shower Rod & Towel Rack - Brushed Nickel by Polder: Kitchen & Dining
A second shower rod would certainly make it easier to keep towels and the shower curtain cleaner and dry. I’m not so certain I’d drop $50 until I tested it with an inexpensive expanding rod just in front of the rod holding the curtain.