Medical Foundation logo design symbol

I am working on a new logo design proposal for Australasian College For Emergency Medicine Foundation.

Since it's about children, about education, about hopes and fundraising I have created a colorful interpretation of the medical cross which also shows implication and interactions between multiple shapes, forms and colors.

WIP. Which one do you like the most?

Check out my 2014 logo-folio http://goo.gl/8S2ipm
Visit my portfolio website http://alextass.com