Monochrome palette
Marble Inn
From #004567 ink through #006ea1, #2f89be, #5298c5 to #6eb4e3 light, Marble Inn is a tetradic 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
#004567
#006ea1
#2f89be
#5298c5
#6eb4e3
The generator opens with #004567 as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.