Window Treatment?

I have an extremely large window, 4 feet wide x 5 feet, 7-1/2 inches in length. This window is flanked on each side by a window measuring 2 feet wide X 5 feet, 7-1/2 inches in length. At the top of the center window is a palladium window measuring 4 inches in width x 2'in length. I have tried several types of window treatments and am still at a loss as to what looks best. I also have a sliding french door that leads to a deck. I need "HELP". Thanks you for any suggestions you might have.