I have recently seen an article related to butterfly wings colors in 
National Geographic Magazine.
Quite interesting, it can be summarized as "The rich, shimmering colors 
of some butterfly wings are produced not by pigments, but by a special 
geometric formation of cells, a new study suggests." (www.csmonitor.com)

Some links:
http://blogs.ngm.com/blog_central/2011/01/coloring-by-structure.html
http://www.wired.com/wiredscience/2010/06/butterfly-colors/
http://www.csmonitor.com/Science/2010/0614/Source-of-shimmering-colors-found-in-butterfly-wings-revealed
http://www.suite101.com/content/how-butterfly-wings-get-their-beautiful-colors-a249249

Paolo

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