While we're nagging about terrain and talking about eye candy, there's two types of terrain that have been a pain due to their absence (only two, promise).
-Undergrowth, shrubland, chapparal, call it what you like. The idea is something intermediary between grass and forest, made up of tangled man-height tree saplings that make passage very, very hard for both infantry and vehicles. As I see it, it would restrict movement and visibility more than high grass, probably somewhere in the level of rough. As such, it would be a nice alternative to full-out forest in dryer climates (e.g. all around the Mediterranean, in most of the Middle East and southern Africa), and be more credible than high trees in desert maps.
In the case where forest can be superimposed on it, it would become undergrowth proper, turning a nice clean forest into a tangled vegetal mess with trees sticking out of it.
I know there have been discussions here in the past about the movement ratings of forest terrain, mostly boiling down to different people having different experiences of their local forests. As such, if you have a dedicated "undergrowth" terrain, you can use it for unkempt, impassable forest, while the "forest" terrain alone or with "forest ground" would stand for well-mannered forests with nice straight trees planted wide apart like apparently in some places in Finland.
-White rough. It may sound silly, but I've bumped head-first into this one every time I tried to map the Mediterranean coast (again). The current rough palette is excellent for sand and rock desert, including a very nice red desert ground. [self-advertisement]see my CWM Chadian campaign
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Grey rough and impassable are far too dark and best suited for northern climates, off the cuff I'd associate them with Scottish or Norwegian shores.
Just for the look of it, I would really like a lighter rocky terrain, maybe with some inbuilt vegetation.
Without both of these how am I supposed to map
this or
this kind of places?
Disclaimer: I have no idea if the game allows for more terrain types, in code, type or interface, I'm just bouncing ideas.