I have to say, I rather like the entire scheme, save the wax for the purity seal - the green looks a little out of place, but it's probably just me. Regardless of my colour sensibilities, everything is executed nice enough to look great on table top. Keep at it, I'd love to see a fully painted squad of these guys!
Oh, and From The Warp did an article on basing theory that you should check out if you're torn on what to do. I'll link it:
http://fromthewarp.blogspot.com/2012/10/a-look-at-some-basing-color-concepts.html