When I come and think of it, The Age of Megaprojects is only in a state of suspended animation for the time being. Once all the kinks are worked with, a couple bugs stomped, and some wrinkles ironed out, it'll wake back up, and everyone will come up with all sorts of bizarre ideas.
Whever happened to making Teliaxu/Ixian cavern systems? Replicate Undergrotto within DF2010's parameters (making it a hell of alot more challenging than it originally was), build the Tower of Babil from FFIV (since it technically started from underground) and have a fortress not too far away from it with all sorts of dwarven tanks standing guard,
Make a demon-freezer (freezing biomes + hell-pipeline + water = hell freezing over.
I mean c'mon, I already listed a handful of ideas. If that's possible, I don't think the Age is over yet, it's just asleep. What about making an epic hospital with all sorts of warrior doctors, breach the pits and name the fortress Darkplace (or similar)?
It's not over, everyone is just busy figuring the new version out first. You gotta find out the limits before you can break them. It's the Dwarven way.
EDIT:
We also can't forget, Arena Mode is untapped territory. We can try to manufacture all sorts of crazy designs. Just understand how it's made, come up with some ideas, and take the time to find out a way to craft some epic arenas. I already have an idea to craft a series of boat battles as a starter-project for Arena Mode; along with building a chess set with the chess pieces as buildings themselves, or a monstrous stone tree to battle on top of. Materials include the Arena file, an understanding of the mapping system, Notepad++, and a program to help me map it out in overlay fashion (like Adobe Illustrator, for example). Not too hard to figure out. Now to think 3-dimensionally with ASCII characters in building from the "4th Person" perspective.
I haven't started yet, but I already have a method to try out, and it'll take a bit of trial and error before I get the hang of crafting. If I can get that far, I'd also like to see if I can reproduce, let's say, the Bloodfist among the arenas (with magma boilers or something). May not be as stylish, and maybe made of rocks, and lack the props (okay, more like a giant statue of the ship), but it would be the ship nonetheless.
EDIT EDIT:
Disregard my Illustrator method. Too much work for too little progress. However,
This little program ought to be more helpful. Plus, with Photoshop (or equivalent) as the device instead (for layering), it should be more user-friendly.