The Colour Picker

Selecting any of the colour swatches in any of the settings views brings up the colour dialog.

The segmented buttons at the top (Palette | Sliders) select between two views, one which provides a simple palette and the other which uses sliders to allow fine level RGB control

Palette Sliders
Toggle between palette and slider views
Fine-control colour component sliders
Colour swatch to display the current value
Reset to go back to
the original colour
Done to accept the
active colour and
dismiss the dialog