One of the easiest ways to make a theme based cake like a dinosaur, is to use a template. You should start with a piece of paper or cardboard and cut out your desired shape. Then place the template over your square base cake, and sprinkle with cocoa or powdered sugar to make a sillhouette. You can then use different colored frosting to color in your dinosaur using cake decorating tips. You can
. also use decorative toothpicks or plastic dinosaurs to make a scene on top of the cake. There are also dinosaur cake pans and you will need to purchase cake decorating tools and frosting to decorate according to the pan directions. In order to make a 3-D dinosaur cake this will take artistic abilities and you will need to use a variety of cake pans to make the design. A rectangle cake pan, one shaped like feet and most likely a cupcake pan. You can add many different characteristics such as a spiny tail or teeth.