I also have 3 x 5 index cards on which I have written extra chores. They are required to do one chore from the stack of cards every other day.
Here are a few ideas for chores.
*Put up everything from under your bed in the correct place.
*Clean out the trash in the van.
*Dust all the furniture.
*Sweep the front and back porch.
*Take out the trash throughout the house.
*Clean the bathroom counter tops.
We keep a running tally of the boys' points on the menu board in the kitchen. At any given time they can see the points they have earned. When they have earned enough points, they can "cash the points out". So far they only want to save up enough for tablet time, but it's a start.
I also make the point system flexible. For instance, my eldest child wants to earn money for things instead of points. I assign a monetary value to the chores and keep a running total on the menu board.
I hope this gives you a brilliant idea for teaching your children the importance of helping out around the house. Please share your chore ideas with us.