Are you familiar with Barry Reynolds...he authored "Carp On the Fly" ?
One of his favorite patterns is a Clouser Swimming nymph. I posted the fly in the forum "share patterns". Let me know if you want the recipe.
The Swimming Nymph
Hook.. #6 Eagle Claw A057 or similar
Tail..Long fibers with guard hairs dyed burnt orange from a hare's mask + two strands of gold/silver mylar tinsel
Body..Burnt orange underfur from the hare's mask
Thorax.. A good clump of peacock herl pulled over an underbody of burnt orange dubbing palmered with a brown furnace hackle
Head..One or two turns of orange slappen hackle, then a turn or two of peacock herl and a tapered head of orange thread
Tail = hook length
Tinsel= 75% of tail
Body= 1/2 shank
Thorax + head = 1/2 shank
Hackle= 2 hook gaps