I don't know one left-handed person who isn't effusively proud of her left hand. Some will come right out and tell right-handed me they are more creative. But are they?
A 2007 paper in the Journal of Mental and Nervous Disease found musicians, painters, and writers are more likely to be left-handed, but it's not their left hand or their right brain talking. It's the balance of the two hemispheres — the right and left brains' ability to work together — which results in the type of innovative problem-solving that reads as creativity.
True lefties, the 20 percent of the left-handed with absolute right-brain dominance, are not any more likely to be creative than the righties. Most people who write with their left hands lack a dominant side of the brain, and this versatility gives them a creative advantage. Yet there's no reason the same trait couldn't be found in right-handers using both sides of their brains.