I like to look at the pattern in the fabric and then have my quilting do the opposite. IMHO, circling the dots only adds to the round shapes in the quilt, which for my own personal taste, I try to avoid. I understand some people like to augment the shapes in their fabric with similar quilting, and that's just their personal taste; there's certainly nothing wrong with it. But if I had round dots, I'd do a geometric kind of quilting. Say perhaps straight lines that have 45 degree angles in them. You could put one geometric design in the 4 corners, another along the edges, and yet a third one to the center of the quilt. That would give your quilting a "designed" look from an all over perspective.