Jewel palette
Flint Brook
Five stops tuned to sit together without fighting — #004d5e ink anchors the set, #72bed4 opens it up, and #007891, #3293ad, #56a1b7 cross the middle in a triadic arrangement. Flint Brook suits event posters that compete with a wall of other posters. The darkest and lightest stops clear AA as a text pair.
cyanjewelfive-stophigh-contrast
#004d5e
#007891
#3293ad
#56a1b7
#72bed4
The generator opens with #004d5e as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.