These are really nice, I even added them to my main folder so I don't have to look at the crappy native banners in multiplayer.
Outstanding work.
I did a good bit of bannermaking on the original M&B, would you be interested in incorporating some of my old banners (they were based on the banner standardization pack too) if you like them? I'll try to dig up the files later and you can feel free to use them.
They were an attempt to introduce realistic heraldry to the M&B world. I tried to follow the rules of european heraldry as closely as possible.
EDIT: Some of them, maybe all, are here. Hope this works, it's an old link.