The wet fly/flymph patterns, less the bead are probably my most enjoyable stream pattern to fish. Second to that is to incorporate a bead into the pattern to fish a bit deeper. I just have so much success with this type of pattern on streams and rivers, I am somewhat overly preoccupied with them. The bead heads are less successful, for me, on lakes unless fishing a diving Caddis pattern. Wets, Flymphs and Bead Head Patterns are suggestive of Caddis and Mayfly activity. Trailing shucks and sparse tails added to the fly at the bend/rear of shank help sell the Mayfly. Take those components away and the Caddis is left as an option.
Tumbled and then swung, they are an easy to tie pattern for the beginning fly tier. Partridge, Starling or Hen Hackle lend themselves to suggestive wings if sparsely tied. Keep the body (abdomen) lean regardless of the material for a Mayfly and a little fuller for a Caddis. A small, built up thorax of dubbing helps keep the wound hackle from totally collapsing back over the shank. I am not convinced the metal bead needs to be any particular color, but I tend toward the more traditional colors of gold, brass, black and more recently rootbeer. Some tiers advocate for the hot colored bead.
Now is the time to tie for the next trout season, unless you are fortunate to have open waters to fish.