There was a thread about batting pieces that I read yesterday(?) and there was a link to an article that mentioned using alpaca. I did not have any details on preparing the fibers, but it can be done. I'll see if I can find the link.
Here it is:
http://www.quilting-tidbits.com/quilt-batting.html
Alpacas are really neat animals. A friend of mine has 2 of them.