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 .
Gumpaste tip: Use cut-up sponges to support your gumpaste creations. Not only do they support the shape really well, but they also allow air to circulate, cutting down on drying time. - another pinner wrote.