Recently I added this background pattern based on the Shandwick stone in Scotland to an eel/dragon tattoo begun several years ago. To balance a Japanese style chest-piece with wind-bars and a dragon on the other side, we did an entirely dot-work installation of these evocative Celtic triple spirals. I used a very deep blue for the lines and a brighter, lighter blue for infill.
Celtic Spiral Waves Background Tattoo by Pat Fish