Hikaru Dorodango (shiny balls of mud) something that all japanese schoolchildren do, madly sending each other their best mud balls using their cameraphones
Zilon has been Montreal's angry-punk-street-artists for more than 25 years. The old stuff is still all over the city, but I saw some of his recent work in a gallery in Vieux-Montreal today.
also TrashBags works with communities in Cambodia, India and the Phillipines to make bags from recycled magazines, fused plastic bags, and my favorite, old juice boxes.