Here are some cool ideas:
1. Airport/Military Base
There could be all sorts of planes, hangers, lift pads, helicopters, airport terminals, tanks, etc
2. Shopping Mall
We still need a market place. but instead of just an open theme, we make a shopping mall to house all their shops
3. An actually functioning pvp arena
Archspore doesn't have a pvp arena, besides sonics, but more of a terrained theme, large scale, with actual fortresses on both ends.
4. An epic large village with actual villagers
People make houses for villagers, and the villagers move around, reproducing, looking villager like.
Just ideas tossed around. Oh and this all be done without World Edit.
(P.S. Any of you other towns steal our ideas and we will bring fire and pain upon your town)