On one hand, Irishness is a nonspecific global brand of pseudo-old pubs, watered-down Guinness, "Celtic" tattoos and vague New Age spirituality, designed to make white people feel faintly cool. Celtic Tattoos. Celtic tattoos are one of the more popular tattoo choices. Similar to tribal tattoos, Celtic tattoos are primarily black in design but are also seen in other various shades and colors. They can be simple or very complex, depending on your preferences.