I'm going to do the orange peel curves in the triangle sections using an aqua colored thread. I forgot that I had that color and it goes really well with the lighter blues and matches my backing fabric perfectly. For the large white sashing, I'm going to use white thread and make concentric swirls creating a few triangles in the negative space. I really liked how the white broke up the visual pattern of the triangles. I think if I would have used the aqua thread, I would have lost that visual feature.
I started quilting it yesterday, starting with outlining (meaning stitch in the ditch) the large triangle sections. I've opted to use my walking foot for this since this quilt is so big and heavy. I'm already wrestling with it quite a bit even with several tables to support the weight. I hope I can keep my free motion quilting smooth with all that bulk.