Most people have bought a cake with an edible image on it. Maybe it was a cake with the picture of Dora or Tweety Bird, or even a custom-made cake with a picture that had special meaning to someone. You can make these types of cakes inexpensively and right in your own kitchen.
Mix the butter cream frosting. Combine the shortening, butter and cream. Add the vanilla and the icing sugar. Mix on high speed for 5 to 10 minutes. The frosting needs to be fairly thick. If it's not thick enough, add more icing sugar until you have the consistency needed. Set aside.
Print out the picture. Make sure that the picture is in reverse, like looking at a mirror. If you are just beginning, try a simple picture before starting a more detailed one.
Secure the picture and waxed paper. Place your picture on the cutting board and the waxed paper on top of the picture. Tape them both to the cutting board to prevent slippage when tracing and colouring. Use the black food to trace the outline of your picture onto the waxed paper. You can also use black icing gel. Be careful to stay on the lines and not to blur them.
Fill the spaces inside of the outline with coloured icing. You can either use food colouring or buy the tubes of coloured icing gel. Stay inside the lines while colouring the picture. When you have finished colouring your picture, gently press the back of a spoon on the picture. This will help the colours to settle within the grooves, giving a smooth finish. Don't press too hard or your colours will blend together.
Cover the back of the coloured picture with an even coat of frosting the colour of the frosting on your cake. Make sure you spread frosting onto the waxed paper around the picture so the edges all show the same colour.
Set the cutting board in the freezer for a couple of hours, and then remove. Turn the frozen frosting picture over, and place on the iced cake. Gently press onto the cake, and remove the waxed paper. Be careful when removing the paper that you don't pull too hard and pull the image up from the cake. Finish decorating the cake any way you like.