I have made a lot of scrappy quilts. A lot of them have been just been nine patches sewed together with no strips between. I just make sure each block has dark and light fabric and no two prints ever touch each other. And a light fabric always touches a dark fabric. I always add one outside border which pull the quilt together. I usually cut 2 or 2 1/2 inch squares to do this. I like smaller square but you could use what ever size square you want.