Stipgenerator is one of many online comic strip building websites. The web-app is fairly straight forward and no sign-in is required – students could be building a comic strip in minutes.
Comic strips can serve as a very versatile deliverable – important scenes from literature, historical events reenacted, even science concepts explained (“Johnny, I think the techtonic plates below us must be shifting!” “What do you mean, Bob, what do plates have to do with this earthquake?!?”).
Here’s a tutorial from their website, stripgenerator.com: