Memphis palette
Umber Outpost
From #00493d ink through #007563, #30907d, #539d8c to #6fb9a8 light, Umber Outpost 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.
tealmemphisfive-stophigh-contrast
#00493d
#007563
#30907d
#539d8c
#6fb9a8
The generator opens with #00493d as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.