"This really comes down to personal preference," says Foley, explaining that all types of window treatments—from blinds to shades to drapes—can be made with blackout technology. To increase the energy-efficient effect and ensure every spec of light is blocked while enhancing your home's aesthetic, consider hanging curtains over your shades or blinds. "Combining a great patterned blackout shade with a textured solid curtain (or vice versa) and contrasting hardware will create a unique complement to your room decor," says DeLucia.