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. …