Puttergeo

Please help me decide how to quilt a quilt top, which I just finished for my son's wedding. Also, can you give me advice on how to post the picture? I keep getting an error message. I'm trying to attach a picture taken from my computer "pictures" file.
I'm a fairly inexperienced quilter. The quilt has greens, golds and brown batiks, and I'm wondering what color thread I should use so as not to detract from the quilt top pattern? green? Or should I use the transparent thread (is it nylon?)? If transparent, what color bobbin? My backing is dark brown. Does the clear thread hold up and can it be washed?
Also, how would you quilt this, again, given that I am inexperienced. There are log cabin blocks and star blocks, with sashing in between (hard to describe without the picture!). I can't do fancy designs, but want this to look good. What would you suggest?