Last year she asked for Peppa Pig, Woody and Buzz Lightyear and Fireman Sam in the corner, so I explained that she would have to pick one. After much deliberating she came up with Peppa Pig so here's how I did it.

Step one (Left), a vanilla tray bake with a strawberry jam filling.
Step two or three.. (Right) this is the part that takes the most time, I created tones of buttercream icing as that's her favorite and coloured it accordingly. I had to do this a few times to get the right colours and so no cake showed. Once done I chilled the cake overnight.
To finish I piped on the the finishing details and made a sugar paste wand, with the extra icing I piped some 'oink's around her just to finish.
The bottom photo is lopsided but there is what remained after me nieces go to the cake. It went down brilliantly.
Alot easier than I thought.