TARDIS Exterior: The Metropolitan Police Box
Why I went with this design: I originally wanted to make my own custom exterior, and had this visual idea in my head of thinking about a metropolitan police box. And so, I brought my idea to life using Blockbench with some critique from my friends!
Images:

WOW  THATS SO COOL

I like the look of that model :) 
Also the color. Seems like there's some purple hue in there.