Cordless lamps, washable rugs, storage baskets, and more made the cut.

From warm colors to natural materials, these expert-approved ideas have staying power.

Ditching heavy, dark, or fringed drapes and valances—which can make a room feel dingy—in favor of classic Roman shades with border trims, floor-to-ceiling solid curtains, or woven shades.

Unless you’re an industry vet, knowing every design rule is hard. It’s even harder to follow them all, whether or not you’re a pro. Still, there are always going to be things that designers simply can’t ignore when they walk into your home—and unfortunately, some of them cost a pretty penny. Below, five designers spill the six expensive decorating mistakes that make them cringe the most.