I think the creator uses a fractal art software, like Ultra Fractal. His gallery contains a lot of amazing designs!
http://zweezwyy.deviantart.com/art/Ark-Angel-107149646
I played with the Blend tool and came up with a simpler "angel" using hearts in the form of a butterfly.
Patti
Ariel, yes it's easy to create the basic look with the Blend tool, although much of the result is unpredictable to a certain extent. Lighting effects are so much easier in Photo-Paint. Love playing with the Blend tool! Here's another "blend-angel," with lighting effects using Radial Blur and the Luce plugin in PP.This one actually has some ghostly facial features -- totally unplanned.