FRANKLIN, Ky.--Winners of the bulk of the races at the FanDuel Meet at Kentucky Downs--from maidens to graded stakes--receive a big chunk of purse money and a distinctive keepsake of their success at the track that is unlike any other in North America. While it may be hard to put an autographed Fender acoustic guitar on a mantel, it sure is a conversation piece. Allie Sclafani, the marketing director for live racing, spent eight months developing the project that features guitars for the six-day, $15-million meet contested over eight days...