OK, I'M STILL CLUELESS...

WHAT IS A YARN BOMB?
According to Wikipedia YARN BOMBING (aka yarnbombingyarnstormingguerrilla knitting, or graffiti knitting) is a type of graffiti or street art that employs colorful displays of knitted or crocheted cloth rather than paint or chalk. Click on the link above for info on history (Oh yes, it has a history dating all the way back to 2005!!!) and methods & motivation.