I'm not a graphic designer and logos are not my specialty, but I wound up playing around with some butterfly images I thought you might like. If you're intrigued but these aren't quite right, let me know. We can either play around with these - do just one butterfly, or use orange as the dominant color, or try a different sample butterfly, etc. - or find you someone who is an actual graphic designer.
And I know you said you didn't want the butterfly science pictures all over your site, but you also told a very moving story about their meaning in your life, so I wanted to at least run a purple butterfly by you. :)