Curtains
To draw attention to the windows, you can use draperies or curtains. Curtain rods can be installed on either sides of the windows keeping the glass portion empty. You can also install them an inch below the ceiling or the crown molding to create an illusion of maximum height and depth.
Drapes that extend all the way to the floor can add some instant drama to the setting. You can also use valance curtains to create a theater-styled effect. Depending on whether you are looking to let in the sun or block a little of that bright glare, you can choose between sheer drapes or heavy ones.
There are tons of options when it comes to fabrics. In sun rooms, fade resistant fabrics work best. Leave the silk for the upholstery.
Wallpapers
Wallpaper decoration around the picture windows is an easy way to make them the focal point. Floral patterns and damasks work best.
Moldings
Window moldings can be painted to create a contrasting pop-out effect against the wallpaper.