You could try making the seam look like part of the design element. I learned how to seam blocks of knitting together using a crochet hook. You put the two squares or sections side by side. On the bottom right corner of the square on your left, insert the hook from top to bottom. Draw up a loop of white or contrasting yarn. Insert the hook into the bottom left corner of the second square from top to bottom. Draw up a loop. Slip the first stitch over the second. Just keep doing this stitch and alternating from side to side. It makes a pretty zigzag type edging, joins them together, and looks like it was supposed to be there.