Now this is a little more than a regular TARDIS suggestion, so I would like to know what you think about it:

First of, it is the tent that appears throughout the series of Harry Potter movies and books and it's bigger on the inside, so why not?

Exterior:

Interior:

Also, I would like to suggest that this tardis won't make the usual sound and effects, and instead it would disappear immediately (similar to appearation).

Furthermore, I suggest two more models for this:

The marauder's map for a monitor, and a desk lamp for a de/remat lever (I didn't have any better idea for it)

I would love your opinion on this suggestion!

seems good but a bit off topic (then again there is a tree tardis and a door tardis)

 Yeah, and this was originally BOTI, so...

Allow me to direct you to the Official Tardis Exterior Suggestion Thread

 I didn't put it there since it's not just an exterior suggestion.