Make Beliefs Comix is a multilingual comic strip creation service that I've featured in the past. For more than a year they have offered more than 300 printable comic strip templates. Recently, Make Beliefs Comix released a handful of free e-books. The Make Beliefs Comix e-books are PDFs that students customize by filling in the blanks in the document. If your students use Chrome, they can complete the PDF in their web browsers.
Applications for Education
The Make Beliefs Comix e-books provide a nice source of writing prompts for elementary school and middle school students. If your classroom does not have enough computers for every student, take a look at the Make Beliefs Comix printable templates to use as writing prompts.