Marian Eerens charted the colors of each Adventures of Tintin book cover. The only thing missing is the actual covers on the mouseover.
It’s a straightforward thing, but I find these sort of abstract color charts calming for whatever reason. See also the colors of: campaign logos, LEGO kits, Game of Thrones episodes, Mister Rogers’ cardigans, Western films, Avengers comic book covers, science fiction book covers, and more.