Funny Story:
We started giving our daughter $5.00 a week as allowance for small chores she was doing. Setting the table, keeping up on the cat box, etc. She was 10. I took her to the bank once and saw that she had been having her grandmother stop at the bank each week and depositing her $5 into her Minor Account.
Seems the little trinkets she could get out of the treasure box at the bank for making a deposit were more important to her than the money.
She is now 15, and because we have so many expenses related to school activities and figure skating, she does not get an allowance from us. We expect her to help out at the house because we do so much for her, activities, clothes, driving her to friends house constantly, etc.
BTW - When we asked her why she was depositing her money every week, she answered "Because everywhere we go, you guys pay for me, so why do I need the money?"
Maybe you can start a bank account for yours, and instead of giving them an allowance, you could make a weekly deposit, and once in a while let them take out some money they have "saved" for a new toy or something.