I loved the oil slick manicure from Rebeca Minkoff's Fall 2013 show the other day so I thought I'd give it a try. They used all gold and blue shades from Essie, but I decided to try it with Smoldering by Revlon, Just Spotted the Lizard by OPI and Graphite Gravity by Sally Hansen. Use the lightest color as a base coat and once that dries apply blobby lines of each color from darkest to lightest. Use a small brush to gently swirl the colors, careful not to blend them. And there you go, nails that look like pretty little puddles of toxic sludge.