TARDIS Exterior: Type 30 T.A.R.D.I.S
Why I went with this design: I liked the box shape the tardis had but wanted to remain original from the police box, I also liked the wooden brown color along with the brass looking framing. This is meant to be my idea of the default shell for a type 30.
additional information: I assume you already had an idea but just in case, the doors on this open like the ones on the police box do mainly because I'm not a very big fan of the idea of them sliding open. The yellow background of the Gallifreyan texts above door is suppose to be a light on each of the 4 sides similarly to how the lightbulb flashes on the top of the police box.