Okay, this isn't old enough to be true thread necromancy, right?
I'm looking in the cheat menus (which have tons of interesting stuff), but I can't for the life of me find where to change my banner. Camp cheat menu, town cheat menu, even the character cheat menu (increase RtR, persuasion, etc), which I found while writing this post. I'm sure I'm missing something blindingly obvious...
Edit: A bit more searching states that it's in the camp menu, but it's not there on mine. Would the Diplomacy mod (the only one I run) affect this? My current cheat menu in camp:
Find an item...
Change weather..
Increase player renown
Increase Player honor
Update political noets
Update troop notes
Scramble minstrels
Infinite camp
Cheat: Set Debug messages to All
Cheat: set debug messages to Econ Only
Cheat: set debug messages to Political Only
Back to camp menu
Edit 2: Argle! Bloody hellfire, damnation and misinformation! Okay, it's Camp > Take an action, not Camp > Cheat menu. Nevermind. -_-