Hawaiian Ocean Appliqué - A Bed Quilt

I can hardly believe this will be my first post about my Hawaiian Ocean Appliqué Quilt as I have collected fabrics and planned this since I believe September. That's nine months!  I even made a practice charity quilt which you can read all about here.

I have nearly completed the first 20" block.  Above is the front and below is the back.  I'm concerned about the green thread on the back, it's showing over the dolphins on the back rather than blending in and allowing the dolphins to play.  I think perhaps the thread I placed in the photo might look better.  Of course if I change the color on the bottom I will have to be 10x more careful about my thread tension.  Who knows maybe it would just change the problem to the lighter end of the spectrum.

The fabrics I collected are South Sea Imports Zinnia's in Green, Michael Miller Dolphins at Play, and Moda's Atlantis in blue. I have done a mock up of the layout below for you to see; the 20" turtle blocks all around and one 42" dolphin and turtle block in the center. You can see the original pattern here, by Pacific Rim Appliqué, which was given to me by my friend Vicki.  I am using a method of quilt as you go machine hawaiian appliqué with a blanket stitch that I altered to suit my own quilting abilities.  I used fusible interfacing which Rob cut carefully enough that I will have the reverse image to use in a future quilt so there will be no leftover scraps, how about that?

The background of the center dolphins will match the water background behind the turtles when completed.