Ok, for those who don't know, there's a nice little tutorial on the Minecraft Wiki on
how to programmatically create levels. (In fact, there are complete editors people have made, but I prefer to generate levels through code).
Anyway, this allows for some level editing on a massive scale.
So I was watching Lord of the Rings, the scene where they are in the Dwarf City with all those pillars. This inspired me enough to write a quick level generator that created that same big room. Assuming I'm still online, you can check it out here:
http://minecraft.net/play.jsp?server=98ef3934e06c922dba5a60806973bd62Some screenies:

A nice sense of scale ..
Bridge of Khazad-dûm?
A cave filled with pillars. So what do they build? Another pillar ..
Here is the source that generated this level:
LevelEditor.javaKeep up the good work Markus! This is a fun game.