Ok, found the other links. Those are much better.
However, IMHO the default Blender 2.79 icons are still clearer, easier to scan at a glance, and more visually appealing.
As for the multi-coloured editor backgrounds: not for me. I want an editor background to be unobtrusive and not grab my attention, so I can focus on the tasks at hand. The plain default grey suits me perfectly in that respect, even though it may not be exciting. The exciting stuff is what I do insde the editor, not the editor itself.
Obviously this is personal preference. Personally I don’t go nuts over flat design, having seen many design trends come and go. I’m quite sure it won’t be long before flat design is seen as gruesomely old and boring, like every other trend that preceded it.
But I can see how your setup would be appealing to some people as a custom theme.
Edit: Just thinking about this some more, IMO your icons would be improved by a finer border and less intense colour. The heavy border takes the eye away from the icon content itself, which I probably why I was finding the defaults easier to scan. The colour saturation is a bit much for a dark theme too. It clashes with the text. Ideally you want the visual impact of icon and text pretty well balanced.