I happened onto a website that will let you down load their butterflies pictures and catilipillar(spellcheck).
Anyway all you have to do is provide a link to their website whenever you use a picture. Only the ones on the front page and they are beautiful.
-http://www.joyfulbutterfly.com
-http://www.joyfulbutterfly.com
-http://www.joyfulbutterfly.com