Wallpaper

Photo: Lucas Allen; design: Suzanne & Lauren McGrath

9 of 10
What's the one mistake that most people make?
"Double and triple check that your pattern is running in the right direction," says Becker. "So many people install wallpaper and realize afterwards that the pattern is upside down." And, of course, make sure the patterns line up so it's not obvious where one roll ends and another begins.