Perhaps it's been mentioned before but I had some leftover batting material after trimming. I thought I'd put some in a bird suet feeder and see if the birds would like it for their nests. I used to use fur from my dogs but they didn't seem to like that. I no sooner put it out there when a lovely goldfinch landed and began tearing segments off and flying away with a beak full. She comes back each day for more.
I would love to see this nest because it will be the warmest and most decorative of any other birds. So instead of tossing those scraps of batting, pull them apart and buy yourself a cheap suet feeder and hang it out and watch the fun.