Re: a few simple stonefly nymphs
That last one is real nice. The length and proportions are nice, and I like that wing pad a lot. But I wouldn't worry about changing the color. Stonefly nymphs don't usually display as much color variation as the adults. Light tan and brown usually get by for most.
Around here you see a lot green stonefly nymphs for the Skwala because the adults often show some green but the nymphs are light tan. Same with the salmonfly, most patterns feature a bright orange abdomen but the actual bugs do not. I guess it doesn't hurt, it might be a trigger for fish that have seen adults on the water, but as you know, the nymph doesn't "emerge" and show it's adult colors in the water. So if you are fishing stonefly nymphs, it is prior to a hatch and the predominant adult color isn't seen by fish under water. I think it's more of sales gimmick.