This mod will generate a different set of tunnels each time you play (the tunnels can be different even in two saves with the same seed)
There is only one "special" room, so if you have any good ideas, let me know.
Download
http://www.mediafire.com/?w2q4c7egkbn0cvb
Extract this to your SCP-CB (version 0.9.3) directory, merge all folders, and run the edited executable.
Changelist:
Spoiler