If you wish to suggest specific rooms I recommend seeing Milk's thread TARDIS Interior Suggestion Thread (Official)
If you're suggesting a method for a user to create rooms for a Tardis (other than block by block and by hand) I recommend adding many more details.
As suggestions have already been made on the topic of "room creation," this thread serves no value unless you have a unique method of implementation in mind.
I recommend thinking about the following:
...and then incorporating these ideas into the thread.
It would make the thread much more interesting and add some substance, although that's just my advice