Gradual toe nail art pictures in 2015 style

Quick answer：

Gradual toe nail art refers to nail designs that transition smoothly from one color or pattern to another. In 2015, popular styles included metallics, pastels, and abstract patterns. These designs were often characterized by a blend of colors and textures, creating a unique and eye-catching look. To find images of such nail art from 2015, one could search online nail art communities, beauty blogs, or social media platforms like Instagram.