Small scraps are great for smaller projects. I also like to use them in practice sandwiches for FMQ. To piece together, I lay one piece on top of another, cut a nice straight edge, then butt the two nicely cut edges together. I place a few pieces of masking tape across the seam to hold them tight and remove when the stitching reaches the tape. I use a wide and long zig zag stitch and sometimes need to loosen the tension on the presser foot so it feeds evenly and does not pucker.