My best pattern for trout has always been a simple black oil bead, peacock herl body and peacock sword tail. I admit I have not caught anything on an actual fly rod with it but behind a casting bobber it has been killer since I started using them.
It always worked even better when a couple pieces of herl started to come undone from fish hitting it. 3-5 strands come loose and the big ones seemed to finally decide it was worth eating.
I use several patterns based on the tying techniques for Denny's stillwater nymph and have caught a ton of fish on them.
My mallard and peacock - there is an SBS here on how to tie it (add a black bead if you want)
olive maribou, peacock herl body, and a red grizzly hackle - close to Denny's but herl vice simi seal
rust maribou, peacock herl body, and a red grizzly hackle - close to Denny's but herl vice simi seal
tie the same as the mallard and peacock, but use gold antron for the body and add a white bead
Basically, I use the same technique for tying the 4 above but I change out the materials used to match what is hatching.
I also tie up an olive or bright green bodied nymph, gold rib, and a pheasant tail back, thorax is brown dubbing, and the tips from the back become legs tied back at a 45 degree angle.
For standard known nymph patterns, black bugger with crystal flash, shhep creek special, a hares ear, copper john, PTN, martis midge, and occasionally a damsel pattern when the hatch is on.
For dries, adams, BWO, EHC, stimulator
I have a ton of other flies i my box, but, these dozen or so flies usually work. If I am not catching fish on one of these it is most likely my technique, or I am not at the right depth, not usually the fly.
The "Shop Vac" is listed in the Blue Ribbon Flies 2002 tying instructions. It was designed by Rowen Nyman who work for Craig before he went out on his own. He guides out of the Lost Fork Ranch and ties professionally for the Montana Fly CO...
Back in the day, this was the fly in the bins at BRF that was called the "Shop Vac":