How brilliant is this? You can put up a tension rod and it doesn't have to be ugly!!!! You can even use two different curtains. Double Spring Tension Rod
Perfect for our "window wall" as they still allow light in the room and do not feel as though they are taking up space, as our current curtains do. May do them like this, or flat, without any ruffling.
For our bedroom....curtains on tension rods for the stupid small windows - this just might work; but how to get around the window crank at bottom?