The prints do look to be feed sack era, if they are NOT tightly woven they should be feed sacks. If you have 20 of them it would be for a quilt. I made my antique blocks into a quilt using a yellow sashing that matches the center circle. Also used the 30's green in the borders. I love the quilt I made in the late 80's, I machine pieced the top but hand quilted it.
My blocks were made by my MIL and I was hand quilting it when she passed.
Jan