The activity I use the most is Tell a Story. Students are able to choose from a selection of storylines then create their narrative story by customizing the setting, characters, plot and text. They can create as many pages as they want and print or share the digital book with friends and family. It is mainly recommended for 3rd grade and up. The process starts by choosing from six possible storylines.
Spell a Picture is usually recommended for K-3rd. It prompts you to choose a background scene and begin by choosing a letter. Pictures will appear that start with that letter ("c" was chosen) and relates to the scene. Students would pick one of the pictures and spell it out below. It's just a cool way to practice spelling!
Make a Picture is also great for K-3rd students. They are able to create single scenes at a time by choosing a storyline background and adding characters, text, and props.
It is a fun way to reinforce literary elements and dialogue before jumping into creating an entire story. Students who are up for a challenge can actually make their own movie and design the scenes with action and dialogue. It really is worth it to check out all the activities that Kerpoof has to offer. It is free to sign up and you can even setup an educator account so all of your students have their own accounts to save work. If you try it, let me know what you think.