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We're not talking a fuchsia pantsuit. Just a pop of color—say, in a necklace or scarf—can light up your face, and your mood. Not sure what to add to your wardrobe of black and greige? Try blue: "It's universally considered a 'happy' color, and there's a shade that looks good on everyone," says fashion stylist Joe Lupo, coauthor of Life in Color. If your skin tone is warm (it looks yellow-orange next to a piece of white paper), choose royal blues; if your complexion is cool (it has a more pinkish cast), try icier blues or aquas.