I've always felt that the USSR and Nazi Germany should keep Russia and Germany's normal UCS colours: as a result, we should press on with finishing the HPCS and denote political systen changes (monarchy to communism and democratic to national socialist/fascist) in dedicated HPCS maps.
Also, in addition to those listed by Iori, I think the UN should have a colour (most likely the blue of the UN-flag), to denote times when the UN is administering a country, region, as they did in Eastern Slavonia, Baranja and Western Sirmium, West New Guinea, Cambodia, Kosovo and East Timor. But it's a very minor thing.
Also, in addition to those listed by Iori, I think the UN should have a colour (most likely the blue of the UN-flag), to denote times when the UN is administering a country, region, as they did in Eastern Slavonia, Baranja and Western Sirmium, West New Guinea, Cambodia, Kosovo and East Timor. But it's a very minor thing.

