Monochrome palette
Oyster Dune
From #004473 ink through #1f6ca9, #3e87c6, #5b96cd to #76b3eb light, Oyster Dune is a analogous progression that holds together at any size. Use it for event posters that compete with a wall of other posters. The darkest and lightest stops clear AA as a text pair.
skymonochromefive-stophigh-contrast
#004473
#1f6ca9
#3e87c6
#5b96cd
#76b3eb
The generator opens with #004473 as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.