Make your own custom nail polish

Seen at: Isaac Mizrahi (and a ton of other shows)
How to do it: CND (Creative Nail Design) artist Wanda Ruiz makes custom nail polish shades for lots of shows at Fashion Week. She shared a couple tips for trying it at home: "Don't throw away your old polish bottles, keep them around and rinse them with acetone to re-use. Then play with different colors and effects. One of my favorites is to take a dark color like black, grey, navy blue, whatever, and add red on top of it. It gives it a black cherry look."