This cute green snake icon is by Troy Boy Design:

http://www.troyboydesign.com/

http://www.iconarchive.com/artist/troyboydesign.html

Downloaded from:

http://www.iconarchive.com/show/delightful-zodiac-icons-by-troyboydesign/Snake-icon.html

According to IconArchive.com at 1:50 EST 2/19/2013:

"License: Free for non-commercial use."