I just saw this shower curtain on the Anthropoligie site and think I just might have to try and make something a little like it--it's just so cool. 

I'll have to see how much it would cost in fabric to create it.  I'm thinking I'd use a plain sheet for the back and several colors of simple cotton to gather for the ombre ruffles.  The one Anthropologie sells is $118.  I think I'd try making it in 2 or 3 sections (maybe 3 ruffles/section) and then joining the sections so there isn't so much fabric at once at the machine.  Hmmmm.