Mermaid birthday party DIY ideas. Dessert table. Who doesn't love mermaids?! This is genius! So perfect for kids birthday parties! Under the sea and the little mermaid as a party is awesome! So many DIY ideas that are easy and cheap. Which is even better since we done want to break our budgets throwing a mermaid party. I like the food, dessert, decorating, activity ideas! Love it saving it for later!