currency is elder than caesar but anyway you cant turn back time. or who would want to try that ?
i know of three initiatives all in all that follow the general goal to provide exchange markets in which whatever goods can be traded. one of which and the eldest is located in Brazil where people successfully established an alternative to national currency; the other two smaller ranged ones are located in my immediate local neighbourhood, say me quarter.
the one of the latter i got aware of some months ago. its an Umsonstladen thats open few hours a week, where you can bring what you dont need anymore but still is of use and take away what may fill in your current needs. the other is an interesting initiative of local middle range entrepreneurs who follow the brazilian example in its attempt to establish an alternative local currency in gestalt of credit points that enables citizens to purchase food, goods as well as service, in exchange for investing either food, goods or service.