In order to decorate A Fire Truck Birthday Cake, you will need the following: 3 chocolate cakes baked in loaf pans, Oreo type sandwich cookies, candies, and brightly colored icing.
Level off the cakes, by cutting away the beveled tops. Place one of them onto a your serving tray. Cut 1/3 of one of the cakes, and set it aside. Ice the top of the 2/3 portion of cake. Turn it face down, placing it on top of the first loaf. Line up the rear of the cakes to match. Cut the 3rd cake in half. Ice the top of one half and adhere it to the other half. Turn it vertically, and place it at the front of the loaf. This is your truck.
Crumb coat your cake in red. To get really vibrant dye, use a gel food coloring. Top with your second coat. Use Oreo type sandwich cookies for wheels. Attach them to your vehicle. Pipe gray icing on to define your truck. Pipe on windows, ladder, and outline it. Use licorice as a fire hose. Attach it to your vehicle. Use candies for lights and sirens.