Also, I had an idea. The Tribunal and the Daedric cults both have big temples in Morrowind, but the Imperial religion only seems to have tiny one-room shrines in the back of forts. However, the Imperial culture in the game seems to be heavily based on real-life ancient Roman culture, which was known for grand architecture including great temples. It would be so cool to have a proper Imperial temple, with statues of the nine gods, in the Imperial district, possibly with its own music.
We could also have a combat arena like the Colisseum and the Vivec arena. Have the fights increase in difficulty as the player gets stronger. What do you think? (The arena would only happen if one person signs on to do just that)