I`ve come across this kind of street art before, and I now discovered that it even has a name: Yarn bombing.
Yarn bombing seems to be trending as an alternative to graffiti – always cheerful and peaceful, never aggressive and obscene, and I also think it spreads an air of generosity. After all, someone has spent a lot of time and money making those pretty little things, often very evidently with a lot of love, and then they take them to public spaces for everybody to enjoy. Feminine is a good word that springs to my mind (while I always associated graffiti with masculinity).
This is part of those which can be admired in my town at the moment:
Photos from others also show a line of fish which has been draped around a boat at the harbour, so need to go back and have another look…