Monochrome palette
Grape Square
From #00558f ink through #8f5700, #0069af, #b26e00 to #2e84cd light, Grape Square is a analogous progression that holds together at any size. Use it for book covers that read at thumbnail size.
skymonochromefive-stop
#00558f
#8f5700
#0069af
#b26e00
#2e84cd
The generator opens with #00558f as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.