Create seven colored layers of the cake and arrange them in rainbow order with a simple buttercream frosting.
Make thin rainbow-colored crepes and stack them with buttercream to craft a gourmet cake.
Add unicorn horn
eyes, and mouth on the plain buttercream cake and decorate its mane with rainbow buttercream.
Decorate the cake with rainbow-colored macarons and choose from various styles like macaron tower or cascading macaron.
Make an ombre effect with rainbow-colored buttercream frosting and create a mesmerizing display of color and texture.