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.
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.