Monochromatic
Backgrounds
Pick the HUE and saturation for the primary color.
And adjust the lightness for the primary color.
Variant
Set the saturation for the primary variant.
And the lightness for the primary variant.
Foregrounds
Set the saturation for the secondary color.
And it lighness.
Variant
Set the saturation for the secondary variant.
And the lightness for the secondary variant.
Accent
Select the saturation for the tertiary color.
And its lightness.