The colour picker was a nice opportunity to do something a little different. Much of the editor's UI is stripped back and minimal, so as not to distract from the design of your site. I wanted the editor to be simple, but beautiful. Good UI should be invisible (so to speak). But the colour picker was a unique part where the UI required something a little different to many of the editing panels throughout the product. I could also follow the design of colour pickers we see in all design software, but that seemed dull. Why not do something visually more inspiring.
The colour wheel presented here is fun to play with, clicking and dragging around the colour wheel to explore the colours (previewed live in the editor), and dragging the sliders below changes the colour saturation and lightness/darkness. Super useful is the palette of recently used colours — of course consistency is key in web design, so make it easy for the user to be consistent with their colour choices.