Farrow & Ball Stiffkey Blue 281
"We seem to go in waves — neutrals, then saturated colors. Right now, I'm drawn to this dramatic blue, so dark it's almost a neutral. We named it after a beach in Norfolk where the mud is this extraordinary blue, and it turns all the cockles and mussels this color. I'd use it with black or pale blue and other silvery, watery shades." —Sarah Cole