The background is an adaption of the Darning Wave in Brenda Hart's Favorite Stitches II, located on page 46.
For this, use 1 ply Watercolours 180, Green Tea.
Do not "Darn" the stitch as traditionally rendered, but work it one full wave across at a time.
Follow the diagram below as the spaces are altered from the original pattern.
Youʼre all finished! Stand back and admire your beautiful little flying jewel!
Guide Note: You can download Barbara's original PDF here.