Taking a brief step aside from my typical tastes in design, I confess that I really like the look of the Ruffle frame shelf from Brocade Home. The lines may be more ornate than I usually like, but the white gives it a really clean aesthetic. Now, someone who's more crafty than me could replicate the look with an old frame and paint.
Okay, fine, what's the secret? You've got a white background, so the lines of whatever you put on it stand out more: this shelf makes things look better. This means the less you've got on the shelf, the better it works.
Ruffle Frame Shelf, On sale, $199.