Mary Katrantzou
"I started with a pale-green base and sectioned off three small squares in bright blue. For all other detailing, I used either a striper brush, or acrylic paint and a small paintbrush. You should also use a dotting tool to create perfect black-and-white dots."

RGB Nail Polish in Dew, $16, available at RGB.

Photos: Maria Valentino/MCV Photo; Madeline Poole