Ran across this article: http://www.news.harvard.edu/gazette/2004/03.11/01-mockus.html
Apparently, the Mayor of Bogota, Columbia made ostentatious requests of the city that were overwhelmingly successful.
Some where hybrids of miner state action & voluntary social action meant to create change without direct coercion.
(Admittedly some of the programs used tax money, therefore, not voluntarist, but infinitely less coercive than currently accepted methods).
Handing out 'thumbs up' and 'thumbs down' cards for citizens to peaceably approve or disapprove of others behavior in the street.
Disbanding the transit police and hiring mimes to mock traffic violators (result: traffic fatalities reduced from 1300/year to 600/year)
people use less water (result: 14% decrease in water use compounded by further reduction after they realized the financial savings)
Requesting people voluntarily pay 10% more in taxes (result: 63k people voluntarily paid the extra amount)
Other results: murders reduced from 80/100k to 22/100k.