Building of identification?
It would be cool if there was one city, with a building that could identify it, what I mean is like it would be cool if every city would have its own kind of statue (formed and shaped by the player by moving sectors)
Example: This building could be a statue of a hand, which the player, (after building it) could shape. The player could for example form a fist, or some other sign (not the F-sign please XD) to identify his city, or just give it some character.
I think its important for games to have freedom, so that the player can give "more" of himself and reveal who he really is as an enemy/ally or just a player.