Here is a sample from Comixs.com, I believe this would be a good way for students to create lessons involving new terms or concepts, like Business Law, comparing a "crime" with a "tort" . They could share the lesson with the class for knowledge and reinforfcement.
The next program I used was GoAnimate, I created a Talk show with the host, Mitt Romney, and President Obama, they were talking about how to fix the economy. This is another fun program that could be used for
Concepts, persuasion, lesson reinforcement, terminology, and informative lessons.