I'm just thinking we need a thread to put forth some of our 'good' ideas.
My first idea has probably been done before, but I'm thinking like a fountain:
Birds Eye View:
~~~ ~=Water
~O~ O="Fountainhead"
~~~
Underground View
~~
~^P~
==~P^~==
~~~++++++++^P++++
~~~~Channel~P^++++
~=Water, +=Ground, P^=Pump, "="=Walls.
Basically, I'd run a water source under a building and have it pumped up a z level or two above a small 'pond' of sorts, then have it flow down into the 'pond' I'm also thinking of having system to run the water back into the channel, just for kicks.
And of course, if you desire more dwarfiness, you can substitute magma for water.
My second idea is a "memorial tower'
A 6x6 tower to commemorate your dead. Each layer would be a 6x6 room, smoothed and engraved by a master engraver. Then, in each corner would be placed a statue. A staircase (staircases, perhaps?) would run up and down through the center. For ever 4 military or otherwise notable dwarves, a layer would be added upward, so that you can construct that layer out of something valuable like obsidian. For every 4 civilian dwarves killed, a layer would be added downward. This might simply be smoothed rather than engraved. And I suppose you could also put their coffins by the statues.
So, bring on your ideas!