Those look outstanding. Would love to see some pics of the islands used in one of your games. Well done, and thanks for giving us the "how-to"--helps get the creative juices flowing.
The island in the back of the 5th picture, the one that is crescent-shaped, reminds me of Molokini, off the island of Maui in Hawaii:
http://en.wikipedia.org/wiki/File:Molokini_Aerial.jpg