Current there are 2 maps for Aram. The standard Howling Abyss and the current Butcher Bridge. Both are cool and the Pirate one is a nice change of pace, but could there be some other map skins for it?
I feel like Zaun would be the perfect region to base one on. It's already said to have multiple levels overlooking others, so it'd be interesting to see one of the higher up areas of Zaun while looking down into the chemtech slums beneath.