I prefer to do minimal quilting and not 'confuse' the piecing. On this, my first thought is to do a wavy line thru the center of the first, third and fifth strip in the block. And maybe a small flower or circle in the very center. I would do a large more floral line down the borders. Whether you self bind or use a separate binding is your choice (remember, it is your runner, you get to make the rules!). But, I would tend to do the blue-silver rather than the aqua. I really like your colors and really, really like that you used a small white frame for the blocks.