The code behind avatars/skins/combos is now open source. You can host it locally
or perhaps just study the code if you wish to know more.
Pull requests are also welcome. :-)
Many people have asked me about it so here's at least a short news post about it.
I'm planning to update current icon set in the near future and to make the update process a bit easier.
The new set will include *all* the latest icons from version 1.7.5 and later. 3D/isometric icons will
no longer be added, but they will remain fully functional.
The update will take place as soon as I have some spare time to do it.