There are chores that are to be done everyday at about the same time everyday, and then they have a "clean room" card that I put up on the day of my choosing, and that means they have to do a full room cleaning...laundry downstairs, sheets stripped, trash out, vacuum, etc.
We've been doing this for over a month now, and it is so nice for me to be able just to ask them periodically, if they've done their chart, or ask them to check their chart. It's much more fun for them and they feel like they are getting results from their hard work. Let's face it, children aren't all that thrilled about just having a clean and organized home! It does make it feel more like they are a part of the family too, than doing "chores".