I use them for midges and chironomids. I wrap the whole body with clear or black and then give it a top coat of sally hansens for extra dimension in a fly.
I have also used it as ribbing for basically any fly I wanted to use it on instead of wire.
It makes a killer bloodworm also by the way!
Oh yeah, And the Tabou caddis emerger.
I tie many other things with it, I just can't think of them right now.