I have seen many discussions on how straight lines and angles need some round elements to soften them at times, but the lines are so clean in your quilt I'm not visualizing the feather rings. I think echo quilting, especially in the triangles [triangle quilting with just a hint of curve, do you know what I mean?], and then something with some curve on the borders, but not as much as feathers. Well this seems to be clear as mud; my bargello-in-progress is getting to me, I must go to bed. I'm sure it will talk to you tomorrow; maybe it's tired too...