Before the party, make paddles by taping or gluing paint sticks to paper plates, one per guest. The paddles can be kept simple by using white paper plates, or you could use plates to match the party theme and decorate the wooden “handles” with matching Washi or Duct tape.
To play: For younger kids, have them stand in a circle and throw an inflated balloon in the air. Kids must use their paddles to bat the balloon back and forth while keeping the balloon from touching the ground. For older kids, set up two chairs on either side of the room and stretch a string or piece of crepe streamer in between the chairs to form a “net.” Guests can then team up and bat the balloon back and forth across the net. When the balloon touches the floor, point goes to the opposing team.