I think you're current list is complete for 95% of your nymphing needs. GRHE and BHHE in a variety of sizes and the colors you've listed will cover the flat crawler mayfly nymphs and the black is good for stoneflies, which are always present as they have 2-3 year life cycles. The PT's in the colors you have imitate BWO/Baetis nymphs, another very adundant food in nearly all trout streams. Along with the CJs, brassies, and zebra midges I think you are nearly covered. Add a selection of caddis pupa and you are set! If you fish rivers with large stoneflies then tie up some rubber legs, double bead stones, or squirrel tails in dark colors.
Really, your inventory is complete in my opinion.
Originally Posted by rccola712
Gold Ribbed Hares Ear: Natural, Olive, Black
Pheasant Tail Nymph: Natural, Green, Red, yellow
Copper John: Copper, Red, Blue, Black, Green
Zebra Midges: Assorted Colors