Hi! This is my sons room (excuse the mess!!). It is a small room and the is the only window. The walls are prescott green...eventually we'll get him big boy furniture/bedding...I want a window treatment that will make the room look big and need a black out option. What would be best? Panel vs something w/in the window frame? Also, would I have to pick something light in color? Or would that not matter?? Help!! :-)