[derefr]

Yep. It's just a more gradated version of the iOS Photos app icon. It's pretty easy to see what makes the simpler version look the way it does, when you blow it up[1]: there are just eight translucent roundrects with gradients, and everything else emerges from how they overlap.

(And from the fact that the gradients form a complete hue continuum. Look at the small triangles in the middle to see the destination colors, and see how they match the source colors of their neighbours.)

[1] http://www.icreatemagazine.com/wp-content/uploads/2013/08/Pr...