For F's actual birthday I made her a cake using a castle mould and turned it into a beachy sandcastle type cake.
The cake was a simple pound cake recipe (1lb butter, self-raising flour and caster sugar, 8 eggs and a bit of vanilla). I then sprayed it using edible glimmer spray. The 'sand' was simply crushed digestives.
I then made a fondant pinwheel and flags and assembled it. It was a quick cake to make and quite fun too!