For each colour, have 3 hues of the colour to allow for for colour coding options.
AdminKevin Hoffman (Admin, Boardthing) commented
Thanks for the suggestion! We currently have two hues intentionally, so that you can say "light color" or "dark color" while you are talking. Other screened back, variation hues are baked in so that if you nest cards of the same color, they don't become invisible.
What extra capability would that third hue provide?