I harvested some down from two thrift store blankets recently. Just be advised, its lower quality down than you would expect. The blanket has heavier and better quality shell materials to hide the crappy down inside. My sleeping bag has many many tiny feathers constantly coming out. I thought they would all find their way out leaving the quality down behind, but there is a never ending supply of tiny feathers. After sleeping in it twice (it works great), my clothes were covered in tiny feathers both times.
I had low expectations for the down, so I'm not disappointed. I love the bag and will continue using it with the crappy down in it, but consider yourself warned...
Scott
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I had superhuman powers, but my therapist took them away.