Skateboarders spread this visual sampling way back in the late ’80s. The fad spread among ravers, hip-hop kids and media-addicted suburban youth. At The Alley, a counterculture boutique in Chicago, one of the popular summer T shirts sports a familiar orange cereal box with a boy pouring marijuana leaves into a bowl of “Weedies.” Not amused by satirical infringement on its trademark, Ford issued a cease-and-desist order last year to a line of clothing called Fuct that swiped Ford’s familiar blue-and-white oval. Adidas is cracking down on underground designers who replace the company’s “trefoil” logo with a pot leaf. That’s OK: logo-mania will soon fade into the next big thing. Hot T’s at The Alley feature serial killers, Kurt Cobain’s death certificate and slogans like surf satan. Cool, dude.