Birthday Sheet Cake Ideas


Birthday sheet cakes are a low-cost way to feed a large crowd, but also tend to be a boring way to create a birthday dessert. Basic sheet cakes consist of a thin layer of frosting sandwiched between two rectangular cakes. Frosting covers the layered sheets and results in a plain rectangle shape. Turn this unexciting treat into an impressive piece of dessert art with clever decorating techniques and creative themes.

Dirt Bike

  • Thrill any birthday boy, young or old, with a dirt-bike themed sheet cake. A two-layer, dark chocolate sheet cake with milk chocolate frosting creates the look of dirt and mud. A small dome cake with chocolate frosting provides a hill shape in the middle of the rectangular sheet cake. Crumbled chocolate cookies sprinkled over the hill add to the dirt-covered look of the cake. Several small, plastic dirt bikes positioned around the cake make it look as if a race is taking place.

Flower Garden

  • Any flower lover will enjoy a birthday sheet cake with a flower garden theme. A green frosting-covered chocolate cake looks like it's covered in grass, especially when the cake is cut. Thick, spiky lines of green frosting outline the bottom of the cake for an overgrown field feel. Marzipan wildflowers cover the top of the cake for a three-dimensional flower decoration. Green marzipan leaves stick out from between the flowers to create a natural look.


  • A layered sheet cake with banana yellow frosting provides a cheerful base for a monkey-themed birthday treat. Chocolate frosting forms a large, round monkey face and two small ears. White frosting forms the monkey's cartoon eyes, and pink frosting forms its nose and mouth. Black frosting provides details for the monkey's face, such as the eyes. Tiny plastic bananas cover the sides of the cake for a joyful jungle style.


  • An amusing tombstone sheet cake is easy to create and goes along with any "over the hill" birthday theme. Light gray frosting turns a rectangle sheet cake into stone. Dark black frosting forms the name and birth date for a classic tombstone style. Mini plastic crows and gummy candy worms can surround the cake for an old graveyard feel.

Underwater Scene

  • A simple sheet cake becomes an underwater-themed treat with plenty of blue frosting and plastic cake decorations. Dark blue frosting covers the cake, and wave-patterned light blue frosting trims the bottom for a basic aquatic theme. Tiny marzipan seashells cover the sides of the cake and the bottom edge of the cake top to create a sea floor. Small, colorful, randomly spaced marzipan fish decorate the middle and upper parts of the cake. Green frosting pokes up like seaweed from among the seashells on the cake top, and green eel-shaped marzipan with white frosting eyes form the words "Happy Birthday" across the middle of the cake.

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  • Photo Credit birthday cake image by Julianna Olah from
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