Kirk Deeter via Midcurrent discusses blue and purple flies in the violet spectrum and how well they can work on trout, especially finicky trout.
Kent Klewein follows up with this blue pheasant tail nymph attractor pattern (pictured above).
Nymph Hook: 14-20
Tail: Natural Pheasant Tail
Ribbing: Ultra Wire Small – Blue
Abdomen: Flashabou Dubbing – Light Blue
Shellback: 6-8 strands of Flashabou – Pearl
Thorax/Collar: Natural Pheasant Tail
Thread: 6/0 Brown Uni-Thread
Head: 5/64 to 3/32 Nickel Bead