Knit the City is one London based community embracing the trend. They say:
Using a relatively sustainable and natural material, knitting can also be removed. It avoids the permanency of graffiti and more traditional modes of street art. Yet its cultural impact still stands.
Many knitting projects seem to focus on trees (where they remain knitted temporarily). Drawing creative attention and long standing affection for city trees is an absolute bonus. This is a positive and safe form of community art everyone can enjoy. [Please click on the image for its original source]
contact me at firstname.lastname@example.org