using window curtains with plastic shower liner behind and hung on tension rod - Already had this planned for my master bathroom, but found a very pretty lace shower curtain to hang along with the window curtains (haven't found the right ones yet) LOVE!!!
I'm thinking a single ruffle at the top of the curtains using clip rings so that the ruffle isn't actually sewed to the base curtain. A bit more flexible for changing things up down the road. Also could add cute pom-pom fringe to ruffle.