Just in case anyone was wondering I am not done with this yet. It's just that my current project of creating custom animations for magic units is taking a while as I am very much threading on new ground trying things nobody has to my knowledge tried before. So that'll take a while.
On a related note you have probably asked your self why I don't do custom icons for most of my units. Well, actually you probably haven't. I mean, who really cares right? But I will tell you anyway because I have some time to kill before dinner and nothing good to do with it.
Anyway, when it comes to unit art I find that it must be both good looking and functional. An archer must look like an archer and an axeman like an axeman so that the player can differentiate them at a glance without having to mouse over. And icons are the one place where all this can go tragically wrong.
Playing the game we learn its UI. After very little time we no longer have to think about the unit we are searching for to build. We just find it once, remember it and it's in there forever. So when we need to build a unit we just click it instantly.
If I did custom unit icons than every time you change civs you would have to relearn the whole interface. And in practice this would basically end up with an eternal loop of you staring at the city screen mousing over icons trying to find the bloody axeman. Compound this with the fact that the wiki would only show icons for your selected civ and you get a mess.
Thus I choose to keep it uniform.
Anyway, stay tuned for images of a lightning throwing adept or something. SoonTM.