Oh my .. I love that.. you've done a wonderful job! I would try a couple of different things. Bundle up your blocks and head to LQS that has a nice selection of batiks. I would try them out with fabric that is either a "sand" colored batik...
or one that is that palest blue that I see in at least 2 different fabrics there. I have even seen the sand color with fishes or seashells in the batik.. just audition a couple and see what goes best before you buy.. I think it's going to be lovely! Then I would call it "Sand, sea and sky"