If I have time to enter this month, I have an idea I might try out.

Create a Japan based map, using my Ukiyo-e map objects then go socio-political between individual daimyo family controlled provinces, then doing colored borders with overlapping edges for different political entities... as I said, Daimyo controlled provinces, shinto religious strongholds, buddhist strongholds and areas of control. The Shogunate dominated areas vs. areas of opposition to the Shogun. Instead of flags or crests I would use those Japanese "crests" or family symbols.

This could be interesting. Now if I can squeeze my Profantasy commission around this challenge!

GP