Pictures of nail art in gradient style from 2015

Quick answer：

Gradient nail art became popular in 2015, characterized by smooth transitions of color from one shade to another. This style often involves using multiple colors or a single hue with varying intensities. The designs can range from subtle and pastel to bold and vibrant. 2015 saw a variety of gradient nail art trends, including incorporating metallics, glitters, and even 3D effects.