Monochrome palette
Luminous Abbey
From #004577 ink through #006db6, #2f89d4, #5298d9 to #6eb5f7 light, Luminous Abbey is a analogous progression that holds together at any size. Use it for book covers that read at thumbnail size. The darkest and lightest stops clear AA as a text pair.
skymonochromefive-stophigh-contrast
#004577
#006db6
#2f89d4
#5298d9
#6eb5f7
The generator opens with #004577 as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.