Interesting idea... If we could use maps, then these would obviously be on those. Anyhow, perhaps only \'famous\' people can have wonders named after them(and perhaps runned by them). What I mean is that people who have contributed a lot to the game, or forums, perhaps, can have wonders based on them.
Also, perhaps the wonders can have a unique feature that no other \'thing\' like it has. For example, Xolon\'s smithy might have a special effect that no other smithy has. Anyways, that\'s what I think, even though I kind of stole it off Civilization III, in which differect wonders give different effects. At least I think I did...