Today a returning client came back to build on a tattoo of ravens that he had me do six years ago. Time to be more ambitious! The birds have weathered nicely, softening with aging, and to enhance them we formed a custom arc of Celtic knotwork reaching up onto his shoulder.
I have an entire page that explains the process of building sleeves in this manner: http://www.luckyfish.com/building-a-celtic-sleeve
And the pattern for the ravens, a design inspired by artwork by the Celtic artist Jen Delyth, is available for sale, as is the top arch: