It details how John, following a double knee replacement, had his kneecaps preserved and fashioned into a necklace with designer Theo Fennell. Now, insiders say he plans to extend the idea to create more ghoulish goodbye gifts for his family." Elton has made it clear that the kneecaps were just the start," a source close to the star told us. "He's already talking about leaving vials of his blood for his sons and making sure his ashes are turned into jewelry so his family can wear him close forever. His surgeon later told him he had the "worst knees" he had ever operated on.