Here is the TARDIS cake I made my husband last year.
I made it really early in my pregnancy, in fact, I had found out I was pregnant only the day before, and I was genuinely concerned that my baby may come out blue due to the amount of blue icing I consumed..... I soon got over that though!
The windows are simply white chocolate squares and the 'Warning' panel is just printed from a Google image search.
Heath was very impressed, big birthday points for me.