Portland, Oregon–based architects Heidi Beebe and Doug Skidmore created an updated addition—consisting of a master suite upstairs and kitchen, pantry, powder room, and covered patio downstairs—that’s perfectly integrated with the original house and vibrantly modern at the same time. Playful wallpaper from Graham & Brown livens up the house’s otherwise staid powder room, which also contains a pint-size Ikea sink.