This was the case in Ariel's dining room. The window faces a woodsy area so there was no need for it to close, but the unattractive window needed something to make it look prettier. Here is the before:
I think the whole project was done in less than one hour. Here's how:
1. Measure the width of your window plus a half inch on each side for hems. Cut fabric, then iron the seams flat.
2. I used iron-on binding tape since it's faster than sewing a hem.
3. Tuck the iron-on tape under the hems (bottom and both sides) of your fabric and iron again.
4. For the top, use a yardstick from the hardware store for stability.
5. Staple the fabric to the yardstick.
6. With small nails, gently nail the wood yardstick into the window molding.
7. Staple the fabric into the window molding to create the "folds."
Need privacy? You can easily tuck a roller shade behind the fabric.