I'm not sure how to answer "natural" or ""non-natural" in the poll but these 3 flies from Les Johnson's Fly Fishing Coastal Cutthroat Trout in these colors have worked well for me in the South Sound and Canal. The first two are a tossup as first out of the box unless I see sculpins in the shallows or catch one. @Chucker's pic makes me think the first two are actually natural, but they're not boringThis kind of color scheme;
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I have no idea if SRC actually eat a lot of sand shrimp, but I have caught them in an area that is loaded with sand shrimp, and I once caught a resident coho there that had sand shrimp in its stomach.
James Peach

Mike Kinney Reverse Spider in the colors that usually work for me

Rolled Muddler (gold tinsel body)
