Many of the windows in our new place are over old radiators and it was really tough to figure out curtains for them. I love a curtain that puddles on the floor but it just seemed like a scary fire hazard.
I had this one big panel I got at an Anthro sample sale and used that as my base, cut some of the details apart and then added canvas and lined it with a ticking stripe. The idea was that they would look like modern fabric wall hangings instead of curtains.
A little detail we added later: when we put our air conditioning unit in, we added eye hooks to the end of the dowels at the end of the curtain then hooks in the wall. You can pull the curtain up and see the striped fabric on the back.