I literally threw this together with some fabric I had in my stash. The squares measure 9-1/2 inches. I didn't have enough of any of the fabric to use just one piece but I really think it turned out great. It's about 20 inches wide. You'll want to measure your windows width and multiply by 3 to get enough fabric to make a valance for it.
Red, navy and white checkered and apple print fabric.
Hope you enjoy