My in-laws did something like this in the windows of their home to diffuse the light, and after much thought I decided that was what I wanted to do to. So don't think I thought it up myself. :)
John and his Dad measured the windows and built the wood frames in less than an hour. You go boys!
I couldn't keep up with them and before I was finished covering one frame with fabric, they were done with all four.
I had to iron the fabric (ugh!) so it would lay right, and if you know me, I don't iron. Mom, you'd be proud!
The dumb staple gun kept getting jammed and it made my job so much harder. John finally helped me in the end by nailing in brads as I stretched the fabric.
"Be careful honey!" You probably thought I meant for him to be careful not to fall, but really I was thinking that he better be careful and not mark up my wall with the ladder. Just kidding, probably had you thinking I was totally obnoxious, but I actually held the ladder steady for him. We did however touch up with paint afterwards before we returned the ladder to his Dad.
This is the finished product. Custom window coverings with the prettiest material I could find to match our couches that will eventually go in this room.
The cost--- around $70
FYI, a couple that works together stays together.