Try OPI's Black Onyx ($7.50). There is also Deborah Lippmann, famous manicurist to the stars, who has teamed up with female rock icon Pat Benatar to create the color “Hit Me with Your Best Shot” as part of her Lippmann Collection of nail polishes ($15). It's described as a “glistening gun metal” shade.
Make sure your nails are a short squoval (square-oval) shape. If they are too long they look less daring and more like daggers! This dark color is a fun way to add a little spice to your look. It's also quite sexy on toes, too!