I think the world would be ever so slightly more varied/lively/interesting if most villages put a custom image on their banners for people to associate with them. Under the current system that's wayyyy too expensive, even for very simple images. It would be cool if:
a) We could freely choose to mimic the design on any banner already built in our village when constructing a banner for free
b) We got a new custom image crafting option for banners, that's either much cheaper, or has like 10+ uses
c) We could create a custom default image for our banners, maybe retroactively updating blank banners