5.Give "extra-credit" work around the house for bonus money.
We are far from perfect when it comes to this, but we have a system that has been in effect for some time now. Who knows if it's really teaching them anything, but one can hope.
The kids get paid twice a month on the 1st and 15th. The 15th fell on a Sunday this pay cycle, so we waited and then I forgot to get change yesterday. (I hate keeping it on hand- it's so dirty!) Connor's not about to let me forget his allowance money though, so I made sure to have money today.
They can get up to their age per month, so we divide it up for each pay period. Connor can get up to $4.50 and Camille can get up to $3.50 each time. (It seems fitting to me based on their abilities.) They have basic tasks expected of them, some of which include making their beds, picking up toys and clothes, keeping their bathrooms tidied and putting away backpacks and coats. It would be great if it all got done, but unfortunately it doesn't always happen. Every time they leave clothes out or don't put their backpacks away, etc. I dock money. If I end up injuring myself in the process of tucking them in at night, I will usually give them a warning and then if it's not tended to I'll clean it the next day. Then there's a huge amount deducted from the total.
Today Connor made $4.00 and Camille received $1.00. They understand that they have room to improve, but we try to praise them for the work that was done. It's a little tricky because I have one child that seems to have gotten the "neat freak" gene and one that obviously didn't. I also try to take that into account.
Connor has a rubbermaid box with 3 dividers. When he gets his money he separates out 10% for tithing, 10% for savings, and the rest goes into the spending section. He says he's saving for a 4 wheeler, but he can't seem to keep more than $20 without needing some legos or pokemon cards. We'll have to wait and see how that goes. They both have some money in the bank though and Connor even opened a cd a couple years back now. We have yet to get a divider for Camille's money. She struggles with math a bit more, but perhaps this would be another way to enforce her math skills.
We also let them have opportunities to earn extra money on occasion. They can dust, rake, shovel snow, collect nuts/sticks out of the yard (per bucket), or clean toilets for extra money (as well as other things we see fit). This usually happens when they are desperate for something they want. (I usually assign jobs I really don't like to do.)
Like I said, not a perfect system; there's not an exact formula for their pay, but it seems to be encouraging better habits and enforcing a little work ethic. And it's still going! (I think it's been at least 2 years we've used this method, maybe longer.)
I'm always open to new ideas, I just don't like complicated systems that take too much time and effort to follow through with.