thank you all for your suggestions. I ended up closing and brown along the brown strips to stabalize the quilt. I tried twice to meander quilt, bun in the middle, the weight of the quilt would mess up the tension. After ripping out the quilting twice, I decided to just quilt around each diamond in a bright green thread. It is not exactly how is hoped, but I am still happy with the end result.
I can't get the picture to load, but here is a link to a picture of the finished quilt:
http://www.pinterest.com/pin/193443746469385141/