I have made many bargello probably over two dozen and I still fret over which fabrics to use. There isn't anything that looks out of place with your fabric. Have you thought of added some tans/ecru for a beach?? Scroll down to Sharonsquilts:
http://www.quiltingboard.com/main-f1...g-t262619.html
I usually put my fabric up on the design wall. I would suggest staying away from large prints because they can easily look out of place when cut into small pieces. That is what I had with making this table runner. But I wanted to make this table runner using the fabric that RK had donated to our church: