John,
FWIW, and this is only because I've really been immersed in furled body flies lately, specifically the flies of Ken Hanley...
Ken's "Rockworm Larva" (caddis) uses a furled body of dark olive and olive antron. Tied up with a bead, some copper or gold ribbing, a peacock herl thorax, and some widgeon legs (I use partridge), and you've got a killer fly. I haven't seen Davie's caddis pupa video yet, but will make a note to do so.
Gotta love those caddis
John