I pulled this one out of the hat (boom-tish) for a magical themed birthday party. Pretty simple construction-wise, just four layers of 20cm round cakes held together with buttercream and drinking straws. Then a decorated cake board, with a rabbit made from cupcakes, placed on top of the layers. This was very handy when it came time to cut the cake, the birthday boy's mum just lifted the board off. However, I did hear she couldn't quite bear to throw this layer away and it sat in her laundry for a few weeks. Not sure whether it's still there now....I hope not!