Nails by Stephanie Saddler of Butta Fingers Nail Studio, Cleveland, Ohio.
1. Use a striper brush and black polish to draw two perpendicular lines as shown.
2. Fill in the corner with gray polish.
3. Use a striper brush and white polish to add two white lines, each of which is parallel to one of the original black lines.
4. Fill in two corners with yellow polish.
5. Use a dotting tool to add yellow, white, and black dots. Apply top coat.