In 2009 Banksy launched his biggest ever exhibition at the Bristol museum. Titled “Banksy versus Bristol Museum” the exhibition was conceived, planned and set up by Banksy’s crew and the head of the museum without the knowledge of Bristol City Council, which owns the place, once again demonstrating Banksy’s chutzpah.
One piece created in Banksy’s signature style is a mashup of Jean-Francois Millet’s The Gleaners : http://en.wikipedia.org/wiki/The_Gleaners
Banksy’s piece is aptly named renamed “Agency Job” and has one of the field workers stepping out of the frame.
You can find out more about Banksy here: https://www.artsy.net/artist/banksy