Rainbows and Ninjas = ultimate combination? Rainbows represent all the diversity the earth has to offer. They are carefree and happy, and if you double them up, they get trippy. Leprechauns eating magic cereal treats? Also a rainbow thing. Ninjas, on the other hand, are badass silent assassins, moving in the shadows until it is time to strike with deadly force. So, have your Ninja Rainbow cake and eat it too! Thanks Austen Sweetin. Thanks Ninja Suit.