Potatoes growing out of the ceiling in a tunnel. It's an ad by Lays: 'our potatoes are grown closer than you may think.' Could be an interesting street art concept, hanging growing stuff in subway tunnels etc.
In Melbourne, Stop Child Abuse Now used child-size mannequins to represent children suffering neglect. Mannequins were placed around the city with a poster pasted over the top of the figure that read, “Neglected Children are made to feel invisible.
A few years back, New York ad agency JWT came up with this brilliantly creative campaign for razor company Schick. To illustrate "the power of four," they created a razor so sharp, it even shaves the hair off tattoos! Clever and creative.
Bench Presses Advertisement into Bare Thighs: The ad agency DDB Auckland altered benches to press an advertisement for Superette, a clothing chain in New Zealand, into the bare legs of people who sit on them. They read "Short shorts on sale Superette"