I just love, love, LOVE this idea! My son is always hounding me for ways to earn money, but in all honestly he wants them to be easy chores. How cute is this "postal" idea for odd jobs that need to be done? I'm seriously thinking about doing something like this.
You can customize the cards for boys and girls, and I would carry it further and decorate their mailboxes!
The blogger has her own Etsy store for these printables, but I do have access to a design program, so I will be casing her idea. Check out her blog entry and store if you have time!