Made from a mixture of clay, compost, and seeds, seed bombs can be tossed anonymously into derelict urban sites to green the city. Los Angeles design firm COMMONstudio created the coin- operated Greenaid dispensary to make guerrilla gardening more accessible. Marketing the machines to businesses to rent or to own, the designers have installed more than 150 since 2010, each equipped with a mix of native seeds. The seed bombs are hand-rolled by workers contracted through Chrysalis, an LA nonprofit that helps homeless and low-income residents earn a living wage and work towards self-sufficiency. The vending machines invite people to become casual activists, taking part in the incremental beautification of their environments – using only the loose coins in their pocket.