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"miss havisham's" wedding cake ideas? - ideas for creating a cake with a bike on it

In my English class, our mission is to create the terrible looking cakes in the novel "Great Expectations, that is spoken. But the cake tastes even more delicious. Has anyone any idea what kind of cake you can cook and how I could look bad, and year, without taste? I wish it were a cake, because it is a wedding cake. Thank you for your help!