![](http://www.activewild.com/wp-content/uploads/2015/03/Underside-of-blue-morpho-butterfly-wings.jpg)
Fun facts:
(1) The metallic blue color is not a result of pigmentation, but is an example of iridescence through structural coloration.
(2) The iridescent lamellae are only present on the dorsal sides of their wings, leaving the ventral sides brown, with some decorative ocelli (eyespots).
(Above fun facts are plagiarized from the Morpho page on Wikipedia.)