OK, here's something a little different and interesting that I heard about from a fellow cruiser (David). The website is:
http://www.neptunesociety.com/memorial-reef/

I'm going to insert their text because it explains this better than I could.

"The Neptune Memorial Reef has become a reality off the coast of Miami, Florida, just 3.2 miles east of Key Biscayne. In its final state, the re-creation of the legendary Lost City, will be the largest man-made reef in the world, using 10,000 cubic yards of cement and covering over 600,000 square feet of ocean floor.
With the help of time and nature, this underwater memorial city become a living reef of colorful marine life, coral growth and fish habitat holding secure the remembrances of your own wishes or the dearly departed for all time. You or your family will be able to commemorate loved ones be they living or departed, celebrate occasions or pay your tributes that will be secure in the one of a kind structure that is the Neptune Memorial Reef.
The reef will be a benefit to the local marine ecology. Over the years, living coral will thrive and a whole new ecosystem will evolve.
Neptune Society"

Our friend decided this is a perfect alternative to the urn on the mantel for him. Loved ones learn to dive and can visit the reef memorial. Watch the video, its really cool. Let me know what you think.