ambience and guerilla warfare are the same. they share a common structure, common motives, and common durations.
WEIRD DANCING IN ALL-NIGHT computer-banking lobbies. Unauthorized pyrotechnic displays. Land-art, earth-works as bizarre alien artifacts strewn in State Parks. Burglarize houses but instead of stealing, leave Poetic-Terrorist objects. Kidnap someone & make them happy. Pick someone at random & convince them they're the heir to an enormous, useless & amazing fortune--say 5000 square miles of Antarctica, or an aging circus elephant, or an orphanage in Bombay, or a collection of alchemical mss. Later they will come to realize that for a few moments they believed in something extraordinary, & will perhaps be driven as a result to seek out some more intense mode of existence.
Bolt up brass commemorative plaques in places (public or private) where you have experienced a revelation or had a particularly fulfilling sexual experience, etc.
Go naked for a sign.
Organize a strike in your school or workplace on the grounds that it does not satisfy your need for indolence & spiritual beauty.