Natural color combinations, from the simplest pairings (even black and white) to multi-colored rainbows can be found throughout the animal kingdom: birds, fish, insects, and many others utilize colors for camouflage, mimicry, mate attraction, predator warning, and other uses.
Hobbyist modelers will find inspiration here, as might the adventurous interior designer. Common shade and color combinations will offer the artist much to ponder.