Here is the yarn I spun for the challenge day of the Tour de Fleece 2007. It's a rainbow yarn with a lot of bright feathers. It's my personal Col l'Aubisque.
I first looked up some technique in the book: Spinning Designer Yarns by Diane Varney. The book confirmed what I thought: 2-ply yarn, trapping the stem of each feather in a coil.
Plus it's a rainbow yarn, just for the wow factor. It's a fandango yarn for sure, but I was nervous about setting the twist. I didn't want to ruin the feathers by getting them wet.
My unsolicited advice: way over-spin the single first, so you don't over-ply while doing your coils. That is if you desire spinning with feathers. Perhaps nobody else would. I accept that.
69 yards, 2.2 oz.