Nearly all of them feature flowing earth goddess-esque figures. Just another case of nonprofits needing to use more design.
A great post from a blog called Art Fag City shows a long collection of the logos for women's health, beauty, and support groups. Nearly all of them feature flowing earth goddess-esque figures. There is an argument about how if nonprofits cared more about design, they would be better at communicating about the issues they're trying to solve. This is a great example. I've included a sampling below; check out the full gallery, featuring more than 50 nearly indentical images, here.