Cherry Blossoms by Alyssa Wright writes -
Cherry Blossoms is a backpack that uses a small microcontroller and a GPS unit. Recent news of bombings in Iraq are downloaded to the unit every night, and their relative location to the center of the city are superimposed on a map of Boston. If the wearer walks in a space in Boston that correlates to a site of violence in Baghdad, the backpack detonates and releases a compressed air cloud of confetti, looking for all the world like smoke and shrapnel. Each piece of confetti is inscribed with the name of a civilian who died in the war, and the circumstances of their death.