Another for the mix. How about moose main. Two fibres, light and dark, wound together. My example is a wet fly but you can use this on any.

Just this morning I was tying with stripped peacock...

I have, and do occasionally still do, use stripped hackle quill. Although these days mostly on Snelda salmon flies.
Using Uni 8/0 in black and camel colours it is quite easy to make a passable copy of a stripped peacock body. Very passable if you coat it.
In my fly box for the lochs are some wet flies tied with biot bodies. I haven't had opportunity to use them much so can't report as to their effectiveness.


Cheers,
A.