1. Yarn bombing

    Yarn bombing: Yarn bombing or guerrilla knitting is a type of street art that covers buildings, trees, objects etc in colorful yarn and knitting, instead of spray paint or chalk. The idea was initially about reclaiming public land, but now is a form of decoration, expression, and social and/or political commentary. The sudden appearance adds to the shock factor and explores new and creative ways of activism. http://theconversation.com/knit-one-purl-one-the-mysteries-of-yarn-bombing-unravelled-23461