To Boron: Yep, it is very possible to edit units in themes, thus changing the theme somehow, although it is not possible to mod themes themselves.
Also, MY Ulm Upgrade is ready. Mainly as I wrote above.
General of Ulm has main sprite made from the base of Battle Deacon of Pythium, but the result is very different. I am quite proud of that.

I made attack sprite myself. \O to /O must be the simplest attack animation...
Nobleman of Ulm has graphics taken directly from game. If someone wants, I have green Version too. Played with IrfanView color settings. Again, I made attack sprite.
Black Paladin: main sprite from game, and surprisingly, attack sprite from the game as well! Lots of work, I'll tell you...
Black Lord cost was lowered to make him more useful as a combatant. I would like to have both Warlord and Black Lord be competent Thugs, but I'm afraid Warlord is only useful if you really need flying and don't have any other choice...
I gave supply bonus to Lord Guardian so that Ulm would get one more non-magical support unit, and it makes LG even better during sieges. I think of it as extra storages instead of ability to create more food. I also gave him mapmove 2 he should have.
Liga has graphics up at his page, but those lack shadows. I found out how not to remove shadows...