I think the main color is white with a blue pearl added along with the flake. I don't know how we would give the flake effect but white and blue and a little gray would give the coloring we look for. Maybe varying the length somehow. I think a wooly bugger type would be easiest with the dark white chenille and a short blue hackle feather palmered into the grooves of the chenille might also get us close. Good challenge Ijerkum.