This color picker is a one scrip solution to your design needs. It uses a custom image as the pallet meaning that you can extract any color from any image. It isn't difficult code but it can save you a headache. We also have provided 2 color palettes for you so that the pack is drag and drop ready.
The material changer is a system that allows you to change the material of your objects on game play. The GUI is Drag and drop and the material changer code only requires to specify the new materials to get it working.
This code is necessary for any design project, and with commented code, you can make the script your own and fit any need!
Try it here: http://babilinapps.com/portfolio/unity-ui-color-picker/