I calling this my first successful attempt at fondant covering a cake, as my last two were genuine "cake wrecks" (tasty though!).
I ended up buying Satin Ice after reading a few reviews, instead of trying to make my own again. I had to knead in more navy blue coloring since the blue in the tub was quite bright and not "TARDIS Blue" at all. I did it in small batches, adding powdered sugar to dry it out after adding the gel color. The stars are cookie cutter shapes and then brushed with lustre dust. Same with the "ribbon" on the bottom, it was also the fondant with dust.
The cake was a red velvet recipe that I've been using for years (always a popular cake when I make it) with a chocolate mousse filling. The cake was the Wilton brand pans that leave a hollowed out heart shape to be filled. I knew this was perfect for a Doctor Who themed cake since The Doctor has two hearts! When you cut into it, it looks like a heart Sorry I don't have a photo of the inside, it got devoured before we realized we should have taken one LOL
The TARDIS on top is solid chocolate in the perfect TARDIS blue color. The details were brushed in lustre dust. The little Amy is not edible, but is an action figure since I costume as her quite frequently... I'm in costume in the photo
Funny enough, the BBC was at the bar (The Way Station, in Brooklyn) filming for a special airing on Nov 25th. They managed to make the whole bar sing "Happy Birthday" to me and filmed it for the special with my cake front and center (OMG HAPPY DANCE!). I made sure they got a slice of cake as well!
EDIT: http://www.bbc.co.uk/news/entertainment-arts-25006466 The BBC Clip!