Peacock feathers are sometimes considered good luck, but they are more often regarded as symbols of beauty. They also play a role in the art of feng shui.
There is no evidence to support the notion that peacock feathers or any other good luck charms have any effect on their possessor's luck, but they sometimes make those who own them feel a bit more confident. Confidence often leads to better outcomes, and there is no harm in having a good luck charm. Even if peacock features are not widely considered to be lucky, someone who finds that they deliver feeling of good fortune may want to keep one nearby.