His artwork is mainly graffiti based but there are some oil paintings and modern art stuff that he does. He's done stuff all over the world. They're mainly anti-war, pro freedom, anti environmental pollution, etc. Enlarge the pics for max appreciation.
Protest against bad music - Banksy redesigned the cover and remixed Paris' songs on 500 CD's and placed them in HMV(if memory serves me right) outlets in the UK. Check out the titles on the 'new' songs in the album.