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I have foolishly promised ds an R2D2 birthday cake. My plan is to take a chocolate sponge, some white and blue icing, and edible glitter, and try and make R2D2's head. But with a regular chocolate sponge it will obviously be a bit them wrong shape. Is there any way I can make it more dome like? Am not convinced buttercream icing would be up to the job, and I've had no other ideas.