At the end of my spinning class for this year, the instructor was dividing up the fibres that were left over, and there was a small bag of some unknown breed of sheep, unwashed. I finally agreed to take it, not knowing why.
It wasn't terribly dirty-- greasy yes, with only a few little bits of grass seeds. I carded carefully since it was quite a fine fibre with good crimp, and made combed rovings of it all. There was a bit of waste of short fibres that really weren't useable at all. I then spun it with my trusty CD spindle, very fine, because that's what it wanted to do, and then made a 2-ply on the spindle as well. (I really love my spindle!)
Here's a pic of the small skein. I don't remember how much it weighed, but it was just over 5 gm. I haven't measured the yardage I got out of it, but there is quite a bit. I still have no idea what it will become, but it will be something nice and small. Or it may be incorporated into a larger project.