What I mean is, the arctic regions which are stuck in a perpetual state of winter as the game has no actual season cycle, If you can make purple trees I'm sure they can make some Autumn style trees to add a little bit more diversity to the map.
Heroes of might and magic has many area's to break up the map's look and feel, Desert, Forests, Jungles, Salt Flats etc, If mod tools were active I would be happy to add it into the game if the mod tool's allow me to go that far, I know I can added effects which I will do as well, Whatever I guess I will wait till mod tools come out and do it myself.