A Celtic tattoo design is often used by people to help encourage good luck. This tattoo style is typically used to help ward off evil spirits and promote better fortune for the wearer. The challenges in life make this a popular tattoo choice for many and especially for the Irish. The tattoo you choose will determine what it ultimately means. Some of the most common types of Celtic tattoos include the cross or the knot. These tattoos are bold in appearance and are commonly done in black and gray, but also tattooed in color as well. Celtic tattoos are not gender specific. Some common Celtic images are the Celtic Butterfly,Celtic Cross, Celtic Trinity Knot, and the Celtic Heart.