Make Beliefs Comix is a great service that offers comic strip templates and writing prompts in seven languages. The templates and prompts can be completed online or you can print them out to give to your students.
The latest release from Make Beliefs Comix is a free ebook called Something to Write About (link opens a PDF). The free ebook contains dozens of writing prompts. Students can write in the ebook online and print their work. Alternatively, you can print all or part of the book to give to students.
Applications for Education
One of the things that I like about Something to Write About is that the writing prompts aren't just one sentence, "tell me about something interesting" prompts. Instead, nearly all of the prompts have further suggestions to help students start their stories. In many cases student will find a full page of further suggestions related to the original prompt.
As you can use the writing templates online or as printed documents, Make Beliefs Comix is a good resource for classrooms that do not have enough laptops or tablets for every student.