I love shower curtains! They can add color and softness instantly to a bathroom. Ready-made shower curtains are generally 72" x 72" (6' x 6') and should be hung around 78" high. I like to purchase ready-made shower curtains from Potterybarn, Crate and Barrel, Anthropologie, Restoration Hardware, and Target. I've had great luck with good designs and great quality from these stores. One of my favorite things to do is have shower curtains custom-made so I can hang them high. I like to hang the custom curtain as close to the ceiling as possible to give the illusion of height in the room. This is a great decorating trick! I generally shop at JoAnn Fabrics and Calico Corners to purchase the fabric- you'll need around 6 yards depending on your height- take your finished length, add 12", multiply this number by 2, and then divide it by 36 to get your yardage. A less expensive way to get a custom look shower curtain is to use window curtains. They are not as wide, so you will have to get 2 and have them hang on either side of the tub. They are available in taller lenghts- so you can achieve the illusion of height as well.
Here are some some of my favorite ready-made and custom shower curtains (the ones hung high are custom-made and the lower ones I purchased from one of the stores above):
Here are some ready made shower curtain that I really like for summer:
Potterybarn: Doyle Stipe Organic Shower Curtain:
Anthropologie: Flamenco Shower Curtain:
Crate and Barrel: Marimekko Sarafan Cobalt Shower Curtain: