The idea originated in the celebrated case of Deli Dollars in Great Barrington, Massachusetts. When a local delicatessen owner was refused a bank loan to finance an extension, he turned to his clientele. He issued "deli dollars" - refundable over the course of the following year - to the value of $5,000. In this way, his customers pre-financed the extension. In return, he was guaranteed $5,000 worth of custom and his delicatessen grew even more in the affection and esteem of its local community. What is more, the deli dollars started doing the rounds as an alternative currency, even turning up in the collection plate of a local cleric who was known to have a taste for the deli's pizzas.

I really like the idea of asset-backed currencies.  

She believed in nothing; only her skepticism kept her from being an atheist. -- Jean-Paul Sartre

I'd prefer interest paid in cheese if that's OK.