This 18 Cool Gradients was designed by Osama Dawood https://www.sketchappsources.com/free-source/3607-gradients-ui-kit-sketch-freebie-resource.html

The academic project celebrates the 50th anniversary of the Rolling Stones' work with the goal of developing a digital music album experience, exploring conceptually the feelings of mystery, nostalgy, bliss, delirium and harmony.