This is an interesting website which held by grain food foundation. You can upload your picture to the website, and they will be toasted on the bread. http://www.breadartproject.com/#/workshops
It is very simple to use. First, you can choose the kind of bread you want to draw on from the purple circle. Different kinds of bread will have various colors and shapes of the background. However, how can you draw on it? Let's see the right sight-toast and untoast.
Notice the green circle. It decides the uility of the brushes. "Toast" means that you can use the brushes to make black lines or prints on the white bread, just like the first row in the below picture. "Untoast" means that you can clear the black area with it.
The most useful bottom is on the left side: upload. By using this bottom, you can upload your pictures to the bread. For those who is not good at drawing, they can upload the pictures which is downloaded from the website or took by the camera.
Unwilling to upload pictures? Using the template on the right side down, after adding some of your imagination, you can a beautiful by your own.