The small size of powder rooms means you'll spend less on materials, so they're great places to experiment. "I don't believe in very many rules, but I do love the idea that a powder room should always have loads of personality," designer Mona Ross Berman says of a bathroom in a New Jersey beach house. "And we took turquoise as far as it could go in this one." Wallpaper is Recessed from Studio Printworks.