To me, hand-quilting always looks best no matter if elaborate or simple. I also like the "big stitch" or "utility stitch" which is a form of hand-quilting. Meandering almost always looks good and that I can do well. I now often combine FM with straight line and/or utility stitch and instead of stitching in the ditch, I use the feather stitch over the seam instead. It gives a really great look. Cross-hatching can be a lovely choice also. For modern quilts, straight lines look wonderful. Quickest way for me to "ruin" the look of my top is to try to stitch in the ditch so i go over the ditch or 1/4" to each side. MUCH easier and looks better too, imho.