Here are a few from this site to give you some ideas:
I also use the following for fun:
–Squat and high five jump
–Partners facing each other for a push-up. Push-up and clap opposite hand of partner.
–A “game” I call 5,10,15,20. (Using any number of exercises). Have them line up and do 5 push-ups, run down to the end of the gym and back (or pre-set distance if outside).
Then, 5 push-ups, plus 10 burpees. Run down and back. 5 Push-ups, 10 burpees, and 15 tuck jumps. Run down and back. 5 push-ups, 10 burpees, 15 tuck jumps and 20 lunge jumps. One more run down and back. Great as a finisher!
Hope some of these help!