Holy crap, here are the SCS Whovians! Hello, sweeties!
I did use the new phone box stamp to do a prototype. As I explained when I posted the card to my Tumblr, the stamp was a phone box and not a real police box, ergo you shouldn't even begin to pass it off as a Doctor Who card. Still, I wanted to see what the combination would be like and created a prototype. I used SU's Night of Navy (what I call TARDIS blue) paper and ink and used one of the Tim Holtz-embossing folders just to see what the end result would be until I could figure out how to make a stencil of a real police box. I didn't even post it to my SCS gallery.
However, the cool thing is that a friend who has a machine that makes rubber stamps offered to custom-make a proper police box stamp for me after seeing the prototype, and that's made me all giddy. Though I might just order the Susan M. Brown stamp instead.
You can view the prototype here.