LONDON (Reuters) - British rocker Peter Doherty has reinvented himself as an artist and is showing paintings drawn in his own blood at a London gallery this week. The show called "On Blood: A Portrait of the Artist" displays artwork produced for his 2009 solo album Grace/Wastelands, as well as a dozen canvases scattered around Camden's Cob Gallery. There may be something gruesome or just plain morbid about painting with blood. But the show's co-curator Rachel Chudley told Reuters: "If you look at art through the ages, the subject matter has always been life. ...