Some-one up there said something about Atlantis. That caught my eye. I think an Atlantis theme would be great, or some sort of underwater based mythical theme, with buildings and whatnot. Yey. X-D
Also, some way to have tanks, but not using human vs human, Lego doesn't like that stuff. (Hence using aliens, 'shadow' knights, skeletons, or villians i.e. Blacktron, bandits). I guess they could have humans vs robots. Has that been done before? I'm thinking Matrix type things. Hehe. :-D
[EDIT: I know the second paragraph doesn't really belong in the Historical section, I completely forgot about that.]