Do you have any of those ridiculously wide 70's windows in your place? Our dining room window is 14 feet wide! 14 ft!! Without wanting to fork out hundreds of dollars for a custom window treatment, I found a much cheaper option that will do for now.
I bought two of these finials from Amazon:
Then three of these brackets:
And I got a 14.5 foot wooden dowel from the building supply store. We drilled holes in the end of the dowel to screw on the finials and painted the whole thing white. You could easily paint it black or brown or red or whatever color you feel like you need above your window. The brackets are the best I found (and I looked at a ton!), plus they are pretty when painted the same color as your curtain rod. I just settled for a bunch of Ikea panels like these:
When you get enough panels on there, you can cover a 14 foot expanse. It's not the easiest thing in the world to open and close, but it works for now and all together I spent under $50! I'll get a picture up once we get the curtain rod hung in the right spot - right up next to the ceiling. The panels are 118" long, so I have plenty of fabric to add some height to the room.