Journey colors are specified in Settings -> Company Settings -> Brand.
Journeys shares the Brand Color, Brand Logo, and Font with the rest of the app and booking pages.
Journeys also have some custom colors:
Headings - The color of all headings on the page
Buttons - The background color of all buttons on the page
Main Background - The background color of the main section of the page
Sidebar Background - The background color of the sidebar (left on desktop and bottom on mobile)
We encourage you to try some different colors out and see what looks good! Some brands look good with bright background colors, and some look good with more muted background colors and bright headings and buttons.
See our partners' sample Journey pages for some ideas: