Sumi palette
Lullaby Cove
From #980325 ink through #b02838, #007277, #cf4851 to #008f95 light, Lullaby Cove is a split-complementary progression that holds together at any size. Use it for book covers that read at thumbnail size.
redsumifive-stop
#980325
#b02838
#007277
#cf4851
#008f95
The generator opens with #980325 as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.