Added open doors to the houses and part of some ground blocks.
Ego, altering the set in a specific direction is, I think, what this thread is about. Everyone adds what they would see as useful if they were to put the set in a level, and the set's theme rises out of that. If people are too shy to make their mark on the product then the result is likely to be less useful. Steer it in the direction you see as useful, and even if there's a bit of push and pull from different directions the end result should have a useful core and some interesting extras.
To the end of letting this evolve from eveyone's ideas, I am resisting the temptation to say what I feel it should include.
Edit: In retrospect I think the land I added is paler than I meant it to be. I'll maybe make it darker later today when I have time.