Thought I'd share my tardis.
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This is the out side obviously. Not the prettiest thing to look at, but that wasn't the point.
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A little view of the inside.
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But wait! if you just step inside you will see that it is somehow bigger on the inside. (I used a command block to teleport me when I step inside. It only works for me. I'm an admin in this world so I can do stuff like that.)
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This is my room. I like to keep things simple. I only have so many torches because the lighting is awful on minecraft.
It's a work in progress. I have at least 17 more rooms I need to add.
The best part is the whole thing is surrounded by bedrock. Every wall has bedrock on the other side. For those who don't know, bedrock is an indestructible block in mincraft. Nobody except me and the world owner can get inside. Another perk of being an admin.