[Kody]

Interesting premise!

After spending a good few hours convincing myself it wasn't some elaborate prank, I'd probably start going over it from top to bottom, learning everything possible about the controls, systems, etc..

Change the interior to the classic white that Danny posted above, maybe switch it to the McGann style now and then as well, all those books and the comfy chairs + fireplace in a tardis = win. Well, wins 2nd place anyway for interior. The current one is nice, but lacks a certain.. feel? Homey, maybe? Heh, not sure.

As for outward appearance, bookcase. Well, for indoors anyway, otherwise I'd probably let the chameleon circuit do it's job and get a good laugh out of what it picked half the time.

First "job" would be going to visit many of my friends, just to surprise the hell out of them and then offer them a rather serious proposition of traveling with me, even for awhile, to break up their normal, boring routines and give them a chance to see the universe (myself included).

Though the threatening RTD idea above I greatly approve of.. to see the look on his face, stepping out of a tardis in his private office.