Madness!!
This rectangular shapes pattern shares the same palette as the following: https://www.spoonflower.com/fabric/6524622-pacific-ocean-rectangles-by-cheerful-madness-by-cheerfulmadness_cartoons and https://www.spoonflower.com/fabric/6524755-indian-ocean-rectangles-by-cheerul-madness-by-cheerfulmadness_cartoons