In gallery view we say something that is true of you (e.g. I have a dog). Everyone that this is true for keeps their camera on; everyone that this is not true for covers their camera. Repeat with a new true statement from someone else in the group.
As a virtual game in Zoom, have people narrow their screen so they only see 3 people in a row. Each person will simultaneously try to have one person sitting, one standing , and one out of the frame in their row.