I used this with my students in a high school multiple disabilities classroom! I used it as a behavior management system.
Each student starts with $5 at the beginning of the class. They can earn dollars for good behavior, participation, focus, etc. They lose dollars for not following directions, etc. At the end of the class, they write down the date, description (I did Day 1, 2, 3, 4, etc but this is up to you!), how much they earned that day in deposit, and then they would have to add to find their bank balance.
Every Friday we would 'go shopping'. The students would write a check for how much they want to spend in my 'store' and then withdraw it from their bank account on this sheet.
This was a HUGE success in motivating my students, teaching them functional skills, financial responsibility, saving money tactics, etc.
Eventually you can expand this into using coins, giving the option of donating to a class party, etc.
Hope you like it!