Fun writing exercises for students include eavesdropping and brainstorming. Eavesdropping requires students to overhear someone on a bus or public place, then write a story expanding on what they heard. In brainstorming, students list things that happened to them and write a fictional story about the list.
Another fun writing exercise is Trading Places. In this activity, students pretend to trade places with someone and then describe their day as that person.
Find fun writing exercises for students on EduGuide.org and FunEnglishGames.com, as of 2015. EduGuide.org features 15 exercises with detailed descriptions. FunEnglishGames.com features writing exercises with online prompts for the students.