This s another activity that is totally student-centered. It's my favorite activity of the semester and the students really enjoy it as well. I use this activity to review comparatives and superlatives, but the activity can be easily altered to fit any level and other grammar points. This may be hard to use in a school setting, as the students tend to be noisy outside of the classroom. I haven't tried confning this activity to the classroom, but I think it would be possible.
Here are some of my students doing this activity recently: