A pattern sheet printed with edible ink can be purchased online with a wide variety of pre-specified patterns (a 7.5'' sheet is about $10 on ebay plus $7 shipping). The sheet can then be peeled off and applied to a frosted cake or ice cream cake. But it cannot be applied to fresh whipped cream cakes.
Cake body: Eggless chocolate cake
Filling: Eggless buttercream
Frosting: Eggless buttercream and pre-ordered pattern sheet
If you know how to bake a cake and roughly frost a cake, and if you know how to place an order on ebay, then you do not need to order it from me. DIY is fun!