Blue is a calming color that soothes the mind. Choose blue cabinet hardware for a dominantly cool-colored room, as a contrast in a warm-colored room, or to add a splash of color to a neutral-colored room. Blue cabinet hardware comes in many different styles and shades of blue. Choose between turquoise, bright blue, aqua and royal blue, to metallic shades of blue and verdigris. Blue cabinet knobs look great against a solid-colored cabinet surface.