From left to right in the screenshot with all the banners :
-Angelmoon
-Gaalsien
-Kadesh
-Kushan
-Manaan
-Naabal
-Paaktu
-S'jet
-Siidim
-Soban
-Somtaw
-Taaidan Empire
-Taaidan Republic
-Turanic Raiders
-Vaygr
Installation :
-Unzip the mod in the mod folder in your Kenshi main directory (on steam C:\Program Files (x86)\Steam\steamapps\common\Kenshi\mods). It should be Kenshi/Mods/Banners HW
-Enable the mod on the Kenshi launcher
-Play.
Uninstall :
-Disable the mod through the launcher
-Delete the "Banners HW" inside your Kenshi/mods folder
Special thanks to Nanogiraffe for his guide :
http://steamcommunity.com/sharedfiles/filedetails/?id=882789616
They are grey on white, and I tried to give them a "washed out" feeling. I'm open to suggestion though.
Known issue (minor):
-They follow the ground instead of the building when built. Might be weird looking sometimes.