I used to take my embroidery trial runs stitched out designs as well as fabrics I no longer needed to the Senior Centers as they made quilts. They're no longer around so luckily I take my discarded fabrics to our local thrift store as they also make quilts to put up at auction every couple years. I rarely ever see any of my fabrics make it to their shelves for sale. Guess I'm lucky in my area.
A couple years ago I took 8 large brown paper bags full of good fabrics and a couple gallon size bags of good sized scraps. Only saw a couple pieces of my fabric make it to the shelves and those were dress fabrics.