Putting the app designer into the position of trying to second-guess what colors the end-user will want, is a pain for both the designer and the end-user. Many other configuration APIs make use of a color picker for this purpose. There are many designs, some showing a color wheel, some using sliders, some using RGB, some using HSV (hue, saturation, value), etc. Anything is better than what is there now; nothing.
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