towel storage?

towel storage?

I need some ideas on bath towel storage. Where do you guys put yours? I have no linen closet, and my bathroom is teeny tiny. The cabinet under the sink is small and full of other stuff. Since I moved in, I have just been folding my towels and piling them on the back of the toilet. I only have five bath towels, so it's not that big of a deal. However, my cats like to hop up there and knock them on the floor constantly. In my old apartment, I had one of those shelves that goes over the toilet (like this), but there isn't even room for anything like that in this bathroom. And there is a window above the toilet, so I can't put up shelves. Ideas?
Wondering what it is?

Wondering what it is?

Diseased?

Diseased?

My room :)

My room :)

The east and north side of my bedroom

The east and north side of my bedroom

Spring, Frogs and Spawn!

Spring, Frogs and Spawn!

My front lawn

My front lawn