Dozens of models strutted down a runway at the Rockridge BART station on Saturday, the crowd around them whooping and snapping cellphone pictures. Their outfits were stylish, original and almost entirely made of paper -- old BART tickets to be precise.  In a competition between four schools, students from the Academy of Art University, Oakland School for the Arts, City College of San Francisco and San Francisco State University were tasked with one job: upcycle old BART tickets into fashion.  In coming up with the idea, Alicia Trost, BART chief communications officer, drew inspiration from a dress made out of BART paper tickets 10 years ago by local Oakland fashion designer Sean Porter. “Somebody from a warehouse at BART had called me and said, ‘We have all these boxes of paper tickets, we are going to shred them since we don't use them anymore,” Trost said. “And I said, ‘Don't shred them, let me figure out a way to get artists to do …