If you know some fans that take Doctor Who too seriously, you might be able to trick them with some TARDIS vinyl door decals. They might think they are off to a grand adventure, but really they are just entering your house.
It is just $29.99(USD) (plus $10 shipping to U.S. and Canada, and $15 to anywhere else) over on Etsy. For that price you actually get four decals. One is the large Police Box sign, another is the “pull to open” sign, and the other two are the TARDIS windows. All together, they create your own home TARDIS – assuming you paint your door blue first.
These decals are waterproof and can be removed without leaving residue behind. Supposedly they have three to five years of outdoor life, so your TARDIS will be around for a while.