I’ve taken part in something a little different for me recently called fishbowl conversations. People more articulate than me can explain it alot better so I’ve included a link below but effectively you have 5 chairs in a circle, 4 people sat down and a spare seat. The people sat down discuss the topics and if anyone not sat down wants to take part they must sit down as you can only listen on the outside. When the 5th seat is taken someone else must stand up so there are always only 4 people sat and taking part in the talking.
http://www.funretrospectives.com/fishbowl-conversation/
I found it was a good way to get people up off their seats and moving around, might be good for after lunch when people are feeling lethargic – could also fall flat on its face because no one wants to move!