Try this...
It lists alot of patterns
http://www.freequiltpatterns.info/QuiltCategories/FreeButterflyQuiltPatterns.htm
OR
http://quilterscache.com/B/ButterflyBlock.html
http://quilterscache.com/E/EasyPiecedButterflyBlock.html
http://www.quiltaholics.com/pp/butfly.htm
http://www.patchpieces.com/Paperpiece.html (scroll down the page)
http://www.globnet.com/~flair/founda26.html
http://www.quilterbydesign.com/butterfly2.html
http://www.quilterbydesign.com/butterfly.html
This should keep you busy for a bit, huh? ;)