I think the key success factor with Perdigons is their fast sink rate, so I keep mine pretty simple. My favorite is a body from Gutermann rainbow black metalic thread with a fluorescent orange hot spot and gold bead(Gutermann thread is from the craft / sewing store). I also tie the same body with a fluorescent yellow hot spot and black nickel bead for a rough peeking caddis imitation.
Not a fancy segmented quill look, but both have been very effective fish catchers for me. I frequently trail my Perdigons with a more natural looking nymph that imiates the prevailing hatch -- ie, a little baetis nymph or midge larva at this time of year.