Blueblack Stone:

Andrew's Blueblack Stone: A good generic weighted nymph.
hook: #12 TMC 3761, weighted
thread: black or dark brown
tail: black biots
body: abdomen: dark blue floss overwrapped with closely spaced segments of flattened out 15# brown monofilament (or dark brown swannundaze)
thorax: black angora mixed with some brown, palmered with dark brown hen hackle
wingcase: black quill section with plenty of lacquer for durability