8. Snorting Copper

Several stencils of this artwork have appeared in different locations in London since 2005. It depicted a police officer crouched on the ground holding a straw-like instrument. It had a long trail of paint splatters leading from it to make what looked like a cop snorting an obscene amount of cocaine, presumed to be a representation of corruption in the police force.

Via hankpank.net

9. Cash Machine Girl

Found in London, Cash Machine Girl was a reference to greed in a capitalist society, with big businesses and financial institutions preying on innocent consumers. The mural, which some argue as vandalism, was, ironically, painted over by vandals.