If you want to make a cake using a specific character you can use a colouring book page of that character to guide the process with a handy tutorial from household weblog Brass Tacks and Basics. In addition to the colouring page you'll need wax paper, buttercreme frosting and food colour drops.
Once your cake is baked and frosted, you'll want to print out or copy the colouring book page you want to use. Make sure it is the exact size that you want on your cake. Trim that page and tape it to the back side of a piece of glass (you can borrow one from a photo frame) and tape a piece of wax paper on the front of the glass so you have page/glass/wax. Mix up your frosting colours and start tracing the design with a dark outline colour of frosting. The bottom layer you put on the wax paper will end up being the top layer on the cake. After the details are done go back and frost the primary colours.
When you're finished, put the entire page/glass/wax paper/frosting creation in your freezer until the icing is hard to the touch, around fifteen minutes. Remove the wax paper from the glass and very carefully turn it over and lightly press the design onto the cake and peel away the wax paper before the icing softens.
For full step-by-step instructions and photos visit the source link below.
Super Fancy Cake Decorating Tutorial for Broke Monkeys [Brass Tacks and Basics]