Mismatched nails and toes? Sure, if they're in the same shade family, says Suzi Weiss-Fischmann, artistic director for OPI. "To rock the purple trend that's so hot right now, paint a grapeish tone on toes and lavender on tips," Cosmopolitan advises.

Try: Nicole by OPI in Violet Vibe and Essie in Lilacism.

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