You could use a prop TARDIS for a tool shed, chicken coop, garden shed, file cabinet, etc.1
But, as I was watching that video of Sillysparrowness build her TARDIS, I couldn’t help thinking… This is a time and relative dimensions in space device – why does it need to be enclosed? As long as you are going to use it as a prop, rather than as a storage device of some sort, you would really only need the front, the left or right panel, and the top. Admittedly, then you could only take front or 3/4 perspective view shots. If it were modular, the left and right sides could be swapped back and forth so you could take a left or right-sided 3/4 view picture.
If constructed in such a fashion it wouldn’t take up much room if you were to put it facing into a corner.2