In reply to ksjs:
How big's the room?
Loads and loads of options out there, both with no or very limited equipment. One that I've done is the 'Prisonyard workout'.
Start one side of the room, do 1 burpee. Walk to the other side of the room, do 2 burpess. Walk back and do 3 burpees. Repeat until you get to 20. hard, works all your body.