Have you ever heard/seen this? I hadn't until we were at the River of Lights in the Albuquerque Bio Park.
All the trees, light posts, rocks, etc. in this area were wearing colorful knitted sweaters. Apparently guerrilla knitting (a.k.a. yarn bombing) is quite a popular form of street art, dating back as early as 2004.
I was telling my sister about this yesterday, and she said she saw a bus that was yarn bombed. What have you seen in yarn graffiti?