As a teenager in Neustrelitz (East Germany), I painted small stones purple and left them all over town. Did it for years. It drove the police and Stasi nuts. It meant nothing. It just felt good to do something they couldn't control or understand.
@fesshole That is now kind a social media trend where colored stones can be found on peaks in the alps where the #hashtag#stoaroas is written on. At least here in Austria. Stoaroas is an artificial dialect word that says hiking-stones. Kind of nice but never looked after the hashtag on the Internez.