black butterfly.jpg
Erathic Eric, CC-attrib, non-commercial, share-alike
http://www.flickr.com/photos/invad3r/264173174/

free butterfly.jpg
vol25, CC-attrib, non-commercial
http://www.flickr.com/photos/vol25/2920670496/

Butterfly_top_PSF.png
Pearson Scott Foresman, PD
http://commons.wikimedia.org/wiki/File:Butterfly_top_PSF.png

Butterfly_bottom_PSF.png
Pearson Scott Foresman, PD
http://commons.wikimedia.org/wiki/File:Butterfly_bottom_PSF.png

modern butterfly.jpg
playingwithbrushes, CC-attrib
http://www.flickr.com/photos/playingwithpsp/278491697/