Won’t lie, I’m not a huge nail art fan. I appreciate the detail, but solid colors just suit me better. However, Harley Quinn might like the idea of nail art, particularly when it comes to making pretty patterns out of red and black. So gather a red polish, a black polish, a topcoat, and some plain old scotch tape. Paint all your nails black, except for the nails you want to get fancy with. Paint those ones red.