The hue everyone's crazy about is known as Yves Klein blue, for the 20th-century French abstract artist who made it his signature. Klein was quite colorful himself: He "painted" canvases using naked women covered in pigment as "brushes" and, one day at the beach, scrawled his name in the air, deeming the sky his first work of art. "Klein was always looking to 'the far side of the infinite,' especially in his monochromes," says Leatrice Eiseman, head of the Eiseman Center for Color Information and Training near Seattle. "They struck a chord because people instinctively connect blue with the heavens."
Clockwise from top left: Pillow, Josef Frank for Just Scandinavian, $210. Scarf, Acne, $199. Purse, Nancy Gonzalez, $2,200. Pumps, Rachel Rachel Roy, $89. Leather journals, Graphic Image, starting at $70. Resin ring, Isharya, $123. Lapis ring, Bounkit, $385. Bangles, Afaze, $10 for set of three.