Another cool one (scary and hard!) would be the Terror From The Deep - with all aquatics present and allied (save LA R'lyeh, I think that would be a bit much).
Then there's the Rise of Rome, which would pit 3 human players as EA Ermor, MA Ermor, and MA Pyth against EA Ulm and a slew of Van/Nief/Hel/Jotun/Ut hordes in the north.
In the nature map, most of the nations could be arrayed in what appears at first glance to be an offensive phalanx, but is in fact meant as a defensive ring around one of the Pangaea nations who starts in the back corner with Carrion Woods already active. If possible, set it so that it's considered as having been cast with 999 slaves so it's not going to be dispelled by the players.
