Ancient style nail art, often characterized by traditional Chinese or Japanese aesthetics, features designs that are inspired by nature, history, and folklore. These designs are typically delicate and include elements like flowers, mountains, and mythical creatures. 'Coolness' in this context likely refers to a modern interpretation of ancient designs, combining traditional elements with contemporary trends to create a fresh and appealing look. For pictures, one can find a variety of these designs online or in beauty salons that specialize in nail art.