Two cities!

You would be better off helping them bring their ideas to life, which, I think, are no less interesting than yours, and perhaps even more so. If you looked at the relevant sections of the forum (and judging by the fact that you created this topic, this hasn't been done), you would understand that there are no problems with ideas. The problems are with implementation! Can you model your own cities? Or write scripts? What can you actually do? It's easy to come up with all sorts of stuff (or not-stuff), and let others implement it.