Monochrome palette
Crackling Grove
From #3e6da0 ink through #007692, #007a77, #3191ae to #249793 light, Crackling Grove is a analogous progression that holds together at any size. Use it for book covers that read at thumbnail size.
skymonochromefive-stop
#3e6da0
#007692
#007a77
#3191ae
#249793
The generator opens with #3e6da0 as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.