Here’s a quick post with a tweak to two popular speaking/writing activities. The game can be played in small groups or as a whole class (B1 and above.)
One student rolls two dice four times: one to choose the person in the situation, another one for the action, a third one to decide on the place, and finally a fourth one to determine the time. Focus on grammar first by having the student come up with a grammatically correct sentence that describes the situation. The variety of time references, for example, will demand different tenses and aspects (and situations can change drastically due to this!) Different prepositions will be needed, too, for the different places.
Once the situation is clear, the student comes up with a (more or less) plausible explanation for it. You may want to allow him/her some thinking time and set a time limit for the explanation. The rest of the students can then ask a few questions and decide whether the explanation is good enough or not. Alternatively, the board can be used to generate writing prompts for (short) writing assignments. However you use it, make sure you revise, pre-teach or introduce language related to giving strong opinions and persuasion — your students will badly need it!