Finally the texturing of the Nexuiz flag is done, I've rendered it out in Maya and also managed to get the flag ingame with those textures on. It went a lot quicker than I thought. I thought I had to experiment and recompile and change stuff like a madman for days. But I don't think I spent even spent an hour for that. Good thing though.
Anyway, if you want, as good as, a complete step on how I did this you can follow the thread I have on the Nexuiz forums.