The only thing that I'd add is that the pieces are old and already show some signs of raveling. If they were mine, I'd not sew them until I was sure that I had a real pattern in mind. To know what you might want to do with them, maybe you could 4-8 of each of 4 or 5 solid colors in the same size as these pieces. You could them manipulate them into several different patterns, sew one of each of the patterns. You'd then have a better sense of what you'd like to do with these specific ancient pieces.