I have used several scrap methods. I regularly sew two same size squares (one light one dark) as thread bunnys, gives me a jump start on four or nine patches. A coffee can full of pairs is enough for a small baby quilt. I just finished a top in which I only used blues and tans in a variety of fabrics. Now the blue and tan bins are almost empty. I guess I just look and see which bins are too full and work from there. Embrace the challenge and create what ever pleases you.