Here are some pictures of my small island thoughts. Blue foam can be sculptured with a heat gun for as much melt sculpture or just a little for a tough plastic skin. You could use black flat paint first and then light sprays to simulate rock on the edges or glue up a hump in the middle of the island for a big rock. I would glue on maybe 2x3 inch edging around the edges on top of the main blueboard to hold in the growing medium. When I was building with the sail boat Paddle Duck forum they found that Dap Concrete calking worked better then most things they tried for glueing around water. The holes are punched in very easily in the blue board with 1/2 inch copper tubing and then water wicker rope could be inserted to bring water up to the growing medium.
