I read online that a Hare’s Ear does a good job of imitating stonefly nymphs. So, I started tying them in black. Then, I simplified that further and started to make a black Sexy Walt’s with a bit of chartreuse thread.
Sometimes, I tie it thin and sparse. At other times, I make it bulky, like the one up top. The nymph works really well, and it recently duped some good fish.