Spring's runway beauty looks were all about shimmer, with designers like Prada, Marc Jacobs, and Phillip Lim abandoning poppy lipsticks and smoky eyes in favor of all-over sparkle. If you want to try the Shiny Eye - our nickname for the almost-glossy, slightly tinted eyelids seen backstage at Miu Miu and Charlotte Ronson - there's a one-stop trick to try it out. It's Urban Decay's Primer Potion, and although it's meant to be used underneath eyeshadow, two of its shades have colored undertones that cover eyelids in a makeup equivalent of crushed meteor dust. You can go for Sin (a deeper brown shimmer) or Greed (a pure gold coating), smudge a bit of brown eye pencil into the corners of your eyes, and have a complete eye look for day or night. Just one note: Urban Decay isn't kidding when they promise their primer won't budge from skin, so make sure you have a real makeup remover (read: not just soap and water) to use when you get home.