To begin with, a website. Customers sign up with their name, work address and credit card number. Periodically but randomly, the site will mail empty cardboard boxes of various shapes, sizes and livery to the customer, care of their office.

The customer gets the joy of having a package delivered (and an excuse to get up from their desk and chat with the receptionist) without the expense or hassle of actually buying anything.

Later you can introduce a letter service, mailing out hand-written lorem ipsum. Outsource the penmanship through Etsy.