Good idea for kids. Clutter Busting Game using ping pong balls-Each person chooses a ball, completes the task, then chooses another one. After 30 minutes, whoever has the most balls gets a prize -- like a no-chores day, or gets to pick a movie.
Chore Jar for kids. Put chores on a stick or whatever, and they have to move one from the "to do" jar to the "done" jar. Once they're all in the "done" jar they get a punch or two in their Chore Punch Card.