Swatches

Flux allows you to manage colour 'swatches', these are simply collections of colours that have usually be setup to complement each other. You can download swatches from colourlovers.com

Once you have imported or created a swatch, you can activate it by clicking on it, a tick will appear on the swatch.

The swatch will then become available in areas such as 'background-color' in the Inspector, making in simple to apply complementary colors to areas of your design.