Thousands of fans of Bravo's "Project Runway" reality show are flocking to Bravo's Web site to create their own episodes of the show. The mash-up application available on the site offers snippets of music, video and special effects that viewers can drag and drop into a timeline to create something that looks like a trailer for the show. Viewers can watch their own video collages, and, if they're happy with them, save them for others to watch.