Yeah... I've been thinking about this quite a bit.
Goritsi:
I'm mostly done with my Goritsi terrain. I got some low walls and ruined cathedral, and I am half done with a graveyard. Finally, I'll make a hill with a dead tree.
Nasier:
I'm planning to order some Japanese buildings for this. Maybe make a hill with one of those portal-like things on. Also, some kind of practise field, with archery targets, practise dunnies etc.
Shael Han:
Here I plan to use Chinese style buildings. I also want a garden, and possibly a hill that isn't a hill, but a temple/statue/somesuch.
Teknes:
Here I've been drawing blanks... I know I want some kind of workshop. Maybe some crates and barrels, like a loading area. Maybe a windmill or similar structure.
Hadross:
I have a bunch of buildings for Carnevale, I plan on using a couple of these. A river or canal will be mandatory. Maybe a dock. A coral hill.