The cake model is a chocolate cake with a cherry on top. It is designed as a model to be used as a goal object in a simulation, but of course can be used in any way you could use a standard model.
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cake1.blend -- Blender file with a shiny cherry on top. This model cannot be imported into Unity because Unity doesn't understand the nodes-based shading process, I think. cake1.png is based on this model.
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cake3.blend -- A simpler cherry model, using a simpler material, with a standard BSDF. cake3.fbx is an export from this Blender file.