flatui color picker

uiGradients - Beautiful colored gradients，是以渐变色为主的分享网站，上百种渐变配色方案，可以根据自己的风格搭配，节约了试色时间。

Coolest handpicked Gradient Hues for your next super ⚡ amazing stuff

Beautiful Color Palettes

Trianglify Generator

The daily color digest

Khroma is the fastest way to discover, search, and save color combos you'll want to use.