Once the territory of only the most hardcore punks, black nails became very mainstream for a few years. The trend is now receding, but you'll continue to see it on skater chicks like Avril Lavigne. If you love the classic, serious look, then black is your color of choice, skip the glitter and funny tips. You can find black nail polish almost anywhere these days, but for on-the-run rockers the Sally Hansen quick dry nail pen in black is convenient and inexpensive. Perfect for the low tech punk aesthetic.