Birthday Cake Ideas for a Rectangle Cake


There are many different varieties of birthday cakes, in terms of design, colors and flavors. It can be hard to choose one with so many options. A common type of birthday cake served is a sheet cake, which is also referred to as a rectangle cake. The nice thing about a rectangular birthday cake is that it is easy to decorate in a theme.


  • Create a princess-themed rectangle birthday cake. Rather than decorating it with actual princesses, create a large image of a crown on the cake; this is suitable for an adult as well as a child. This looks great on a rectangle cake with white frosting on it. Pink frosting should be used to create the border around the cake. The crown is made using yellow or gold frosting. For a personal touch, add the name of the birthday girl in the middle of the crown using pink frosting.


  • A fun birthday cake idea is a baseball-themed cake. Begin with a vanilla-flavored rectangle cake. Use green frosting to create the look of the baseball field, brown frosting to create the mound and white frosting to create bases. Use plastic baseball figurines and decorate the cake as if they are playing the game.


  • A tropical, beach scene is another birthday cake idea for a rectangle cake. You can be quite creative with this one. A yellow or white cake frosted with vanilla frosting is a great base for the scene. Use a fun color of frosting, such as orange or pink, to create the border. Yellow frosting can be used to create the sand, and blue can be used to create the water. Add plastic figurines such as palm trees and flip flops. Create tropical flowers in the corners of the cake, using purple and pink for the petals.


  • A unique, gender-neutral idea is to decorate a rectangle birthday cake with an aquarium theme. This incorporates not only fish, but also pebbles and plants. The type of cake can be vanilla or chocolate. Frost the front in blue to create a backdrop for the scene, and add colorful fish of all different kinds. Green frosting is used to make the plants, and pebbles can be added with either bright pink or blue frosting.

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