Attach a sheer curtain panel behind your existing curtains using a bungee cord. Just run the cord through your curtains, attach the bungee hooks to the sides of the rod and stretch it across, and voilà, you have a beautiful sheer inner curtain panel!
DIY Decorating Ideas: If your budget doesn't allow for expensive custom wooden window cornices, make your own. It's actually quite easy to do. You'll save money and still get the look you want. Wooden Window Cornice Tutorial - DIY and Crafts
Towel Window Treatment Use kitchy kitchen dish towels for fun window treatments. Simply clip drapery hooks to the top edge of a dishtowel and hang from a cafe curtain rod. The towels are easy to remove for washing and can also be changed out seasonally.