bepsf Rather than be concerned with the size of this room - why not take the photo to your local carpenter/cabinetry maker with your room's dimensions and see what they can come up with for you?
Bolsters are traditionally round, but they can take on other shapes. This designer has used prints sparingly, and it's a great balance.
Tip: You don't need to go wild with print and pattern. Sometimes a striped window treatment here and a jacquard pillow there is all the pattern a room needs.