Sorted the list All the movies from @Hershey by the color of the film posters from dark to light.
Dark to colorful
0 - 13600
Movie posters where the main color is not black, white or gray (Colorcircle)
13600 - 18000
Just the colors as own list
Colorful-> Light
18000 - End
Unfortunately Letterboxd changes the posters every now and then. If you find a movie that doesn't fit, please post it in the comments ;-)
Updated: 17.07.2022