ColorPalette
A palette that provides a standard, gradient range of colors based on some unifying color concept.
On the low end, the color should be bright and nearly white and useful in dark themes; on the high end, the color should be dark and useful in light themes.
IMPORTANT: This should not be confused with the Silk theme Palette, which is more for identifying colors targeting various, named parts of some widget. In general, if a color palette is present in a widget, it will be used to intelligently color in the silk theme palette.