Another couple to share. Firstly a change of bead and wire colour to the brassie can make all the difference when the fish are being picky. Who knows exactly how colour is perceived by the fish, but certainly a slight change can make the difference between success and a dry net.
The Brassie Rouge:
Hook: TMC 2487 #14 - #20
Bead: Tungsten 'Nymph-Head'
Body: UTC Ultra wire, red
Thorax: Synthetic claret, split thread
Next, a tiny offering that works well either trailed behind a dry fly, NZ style, or in conjunction with a bigger nymph. This is the answer to those days where the fish seem willing to hit only small offerings. Fir the sacrificial bug, I would suggest a dark, drab offering - since when picky enough to only take sub #20 nymphs, a large, flashy bug may just spook them:
Hook : TMC 2488 #22
Body: Copper wire, fine
Thread: 14/0 Sheer, orange
Thorax: Synthetic olive / yellow