My mother made many tops from double knit back when. When she passed my sisters kept all of them. They were pretty, she did Grandmas Fan, Hexagon, Trip Around the World.
If you decide to go ahead, sort thru and get rid of what won't work, you know, bad color, too flimsy, etc.
Then cut them into big squares, 10 or 12 inches, so they stack up neatly. Plan to tie them. Somewhere, someone will be cold and downhearted this winter. I would put charity quilts on my short list of things worth doing.