"Job Balls" chores to be done. With multiple kids, whoever has the most jobs done at the end of whatever time you set, they receive a reward. For one kid, maybe do after so long or if consistently getting done within a week or so, they receive a reward.
Rewarding kids with things they get to do instead of things they get to have. When they do something good, they pick from the jar and get things like to stay up a little later or play outside a little longer etc. Cute idea!