We have Explosion card pattern that would be awesome with this! How-to Make a Fondant Explosion Cake- use royal icing to to make stars and other things. I would not use fondant tastes yucky, prefer buttercream icing .
Princess castle birthday cake is not only attractive but also sends forth a sense of elegance for a princess themed birthday party. Some great examples include the Disney princess castle cake, castle cake, as well as the ice-cream cone castle cake.