Yes, people there is such a thing as yarn bombing and it even has it own day!
According to Wikipedia,
"Yarn bombing, yarnbombing, yarn storming, guerrilla knitting, kniffiti, urban knitting or graffiti knitting is a type of graffiti or street art that employs colorful displays of knitted or crocheted yarn or fiber rather than paint or chalk."
This is so creative, fun and EXPENSIVE! I thought I'd share some of my favorites from around the web.
Note: Yarn bombing may be considered illegal in some jurisdictions.
Get permission from property owners, in writing, if you want to install a yarn bomb on their property.
Maintain your yarn bomb and remove it before it becomes an eyesore.
Get creative and have fun!