I like marabou nymphs tied on a #14 to a #8 size hook. Olive green or black.
If you add a strand or two of tinsle to the tail, or ribbing for a little flash, it can help. Another good choice for gills is an everyday wooly worm, or wooly bugger, again in black.
Caddis drys are always a good choice, they ride high on the water and double as a strike indicator. If you're crafty, try adding a hares ear nymph on a short 6-10 inch leader tied to the hook of a high floating dry such as a stonefly. The dry acts as a ( dare I say, bobber) and attractor, gills come up and often take the nymph below the surface.
If in doubt for gills, I go with about anything in black.
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