Changing the look of a classic urn-shaped lamp is as easy as changing hats. A square bell that flares slightly at the bottom gives it a Victorian feel. Square silk shade, $44, www.potterybarn.com. When paired with a drum shade, the same lamp plays to a different living-room decor. Fourteen-inch white paper drum shade (pictured), $48, Oriental Lamp-shade Company, 212-832-8190.