This was derived from the fine embroidery being produced in England between 1200-1300 called Opus Anglicanum.  Woad, famously linked with the blue face of Boudicca and the Iceni tribe, was used to produce a range of blue dyes for the threads used.
Works well with: Crystal, Pearl, Buckingham, Pebble, Dove, Mulberry, Northern Star, Old Lace.