As you ring in the New Year, chances are you'll have sequins on the brain. So do designers -and not only for the big night-. Spring '10 runways were positively gleaming. Almost all designers encourages you to wear shinny dresses: Extrashort and sweet at Antonio Berardi. Versace takes the plunge. Scuba gets sexy at Emilio Pucci. Oscar de la Renta's hint of neon.