This is a great idea...especially to add a little bit of pattern to a solid curtain or a little solid to a pretty printed curtain... Plus can save you money by not buying the super long curtains.
Shower Curtains on Windows : Once you find the right fit, shower curtains make a genius alternative to more-expensive window treatments. Many come in stylish designs that you'll be proud to move from the bathroom to the bedroom. Source: The Suburban Urbanist What a great idea!!!