Here's the best way I can explain it.
I draw a swooping X on the quilt. I don't start in the corners, and I don't want it to be perfectly centered.
The color shapes in the picture just represent the four uneven curved quadrants I drew.
So I'd sew on the line for the big X. Then, with chalk or a marker or basting thread, I bisect each quadrant - those are the straight lines in the picture (and it doesn't have to be perfect).
Starting in the yellow quadrant, I'd start quilting about 1 inch (or more or less, it's up to you) from the previous line, echoing the gentle curve. When I hit that bisecting line, I stop, turn the quilt, and go back up to the top of the yellow section. And just keep going. When you're done, you go onto the next quadrant. You'd be surprised at how quickly it goes.
It creates a great pattern, you're using the walking foot, and if you've got some variegated thread, it's even better.
It doesn't get in the way of the blocks, and the blocks don't get in the way of the quilting.
I quilt on a Bernina using the #4 stitch (I think it's a #29 on a Janome) which is a slightly wavy stitch. It's not sharp like a zig-zag. It adds a great texture to the quilt.
I lost all my pics in a hard drive crash last year so I can't show you an example. So I hope that rambling explanation made some sense.