2 Interesting Things I've seen.

[Kophka]

1.) Found a boss room/arena at the end of an abandoned mineshaft, at bedrock level.


2.) Found a very depressed creeper, trailing his storm cloud of misery everywhere he went.

 

[MD_Bay]

I lol'ed at the creeper and I'v seen lots of those boss/arena rooms.

 

[epicwin324]

Yeah, I believe the big rooms are going to be implemented in later updates. Notch has told us about wanting bosses, and the rooms seem spacious enough to hold them.