i personally love the look of extra long shower curtains. a standard shower curtains is 72" x 72", which can look really squatty in a room with high ceilings.
i used a pair of regular 84" curtains that i purchased at marshalls (that are dead ringers for west elms ogee panels) in my sons bathroom, and i loved the effect:
i decided to do the same thing in my girls bathroom with some inexpensive panels from ikea:
here is what i started with:
* pair of ikea ritva panels (a favorite of mine. i recommend them ALL. THE. TIME to clients!)
* extra long fabric shower curtain. i bought mine at bed bath and beyond.
to add the trim, i used a fabric glue.
i bought my trim for about $2.50 a yard on ebay, which i think is a huge bargain. if you have ever shopped for trim, you know that most run in the range of $8-15 per yard. do yourself a favor and check out ebay!
to attach the trim, i just put a bead of glue on the edge of my panel, and pressed the trim onto it.
at the ends, i folded it under carefully and secured it with a binder clip. i also put a clip about every 18" or so up the panel.