So here's an amazing accomplishment:
New York yarn artist Olek pulled off an act of epic yarn bombing on Christmas Eve 2010, at 2am. She crocheted a cover for the Wall Street bull. Apparently the bull itself was another act of guerrilla street art, having been placed there without permission in 1987 by artist Arturo Di Modica.
Hats off to Olek! Here's how she did it: