All of those things will work.
Carpet material is a good substitute for animal furs, especially antron. Also if you wife, mother, girlfriend is into knitting you have a goldmine.
In fact most of the natural materials - furs, feathers etc. are pretty cheap and last a long time. Unless you are planning on tyeing classic salmon flies, you can a-find a cheap substitute that will work on almost every pattern.
When sight fishing, look over your shoulder from time to time, you never know who's behind you