I did this cake for my niece's 2nd birthday. She loves Ariel, so I created her castle under the sea. The castle was made using the bundt castle cake pan. I lightly crumb-coated the cake and covered in fondant and smoothed to get the castle's details, and airbrushed. The turrets are from the castle kit. Coral, flowers, and seaweed were made out of royal icing. Various sealife were royal icing and pre-purchased. Sand is graham crackers & sparkling sugar. Shells were candy melts.