I'm working on a Color Palette Asset for Unity, it is soon going to be released.
Color Palette UI in Unity:
Color Palette Collection UI:
More details here, Unity Forum:
forum.unity3d.com/forums/assets-and-asset-store.32/
Video Tutorial zu de Examples:
Bit.ly
API:
Dominikhaas.ch
Issues & Feature requests:
Trello.com