Back in the FASA days, I ran a game with a Time Lord called "The General" whose TARDIS looked like a WWII vintage tank. Climbing down through the hatch was likened to boarding a submarine and the entire interior was riveted metal with a military drab-green paint job and an Army surplus motif. I'd cast Fred Gwynne--circa "The Cotton Club" as The General (with Brian Blessed as a former regeneration) .
His main enemy/rival was a demented Time Lord called "The Clown", whose TARDIS was a garishly painted clown-car--out of which would climb up to eight iterations of himself at a time. (His paradox causing antics were threatening to unravel the timeline, hence The General and co. in pursuit.)
One of The General's companions was a Dalek he sort of rescued from inside The Clown's TARDIS. The Clown had yanked the mutant out of his nice normal Daleky shell and planted him in a yellow and red plastic replacement, with a round yellow smiley face on a spring at the top and harmless spongey hands. With a seriously retinkered vocorder, the poor Dalek's voice was rendered in a goofy clownish tone.
"Ex-term-in-ate! hyuck hyuck hyuck!"
The poor thing nearly went mad before he helped stop The Clown and got a decent proper Dalek shell back--at which point he immediately tried to massacre The General and all of his companions, with a certain amount of success.
So, yah. Tank and Clown Car. The two weirdest TARDIS's I've ever used in a game.
I've been mulling over what form would be good for a TARDIS in my game. Originally, I came up with an ambulance. You could park it anywhere, it's generic, etc. But then I thought what would be a good TARDIS for a villain (or villains), and I got what I reckon is perfect... A door. Not just a door, but any door. There was a DW episode where the Doctor materialised his TARDIS over a real police phonebox, overlaying its exact space-time location. (Start of Logopolis for reference). Suppose our villainous Time Lords did the same with any convenient door. Closed shop fronts, rented hotel rooms, old houses or new. Walk through the door and you're in their TARDIS. When the TARDIS has dematerialised, you just end up in a vacant shop, a normal hotel room, an empty house, etc. You could use this for the PC's TARDIS of course, but there's just something wonderfully portentous and sinister about this that I think is perfect for villains. The front room of the TARDIS (for want of a better term) wouldn't even need to be the traditional control room. It could actually be modelled to look like the interior of whatever it should be - though perhaps a bit off to really throw you. E.g. How can the hotel room be so large inside? How did they furnish the inside of this dillapidated old house so sumptuously. If you press on then the illusion falls apart - you open a door and find yourself amidst gleaming control panels and monitors showing the outside world, etc.
I've been thinking about the interior of my 'Ikea' TARDIS quite a bit, and I think I've hit upon a look to make it more unique than the usual "large room with a console". Since it was originally (when 'accompanied' by my "bootstrap Time Lord" character) a capsule used for Academy field trips, why not make the control room like an auditorium with the console in the middle and multiple rows of 'seating' rising up around it so the console is at the bottom of a 'bowl'? Perfect for students to watch their teachers at work while they demonstrate TARDIS control or some principle of time travel.
THE DOCTOR: I'll do a thing. RIVER SONG: What thing? THE DOCTOR: I don't know. It's a thing in progress. Respect the thing!
I'm sorta thinking about running a Dr Who game, loosely based on a campaign idea someone told me about (which turns out to be awfully similar to one I found on here).
No idea what I'm going to use for the exterior, probably something boring like it morphs into a form appropriate to the locale. Inside though is another story.
I'm using the idea that the interior decor of the tardis is linked in some way to the psyche of the Time Lord(s) who controls it. In the campaign I'm thinking about, all the PCs are Time Lord "sleeper agents" placed on Earth during the Time War as infants. (Either actual Time Lord youths, or adult TLs who've undergone a forced regeneration and had it manipulated to create an infant form). Growing up on Earth and being unaware of their true nature, their psyche is pretty much human so when they finally "find" their Tardis, the decor resembles in part what a 21st century human would think a spaceship from the future would look like. In looks, its going to resemble the Hub from Torchwood, big touchscreens, keyboards seats (with seatbelts) and so on. Metal bulkhead walls,soft overhead lighting and lots of beeping controls.
one of my players played a time lord named "the librarian" (lol). and his tardis was once materialized as a merchant stall like in assassin's creed. His interior is the gallifreyan library macguffin'd into the interior of a tardis.