The word “henna” originates from the plant-based dye , and henna tattooing is an ancient tradition . Henna can also be used to color hair and nails , and a henna tattoo is considered a symbol of good luck . Some people , especially in remote villages , even believe that henna can ward off bad fate and the evil eye , particularly when the designs feature the Hamsa hand or eye motifs . Other popular henna tattoo themes include flowers and intricate geometric patterns .