There is a new option for post-existence planning. Rather than being buried or cremated, you can go through the process known as Promession, where you are dipped in liquid nitrogen, vibrated into powder, freeze-dried, and then buried in a biodegradable coffin made out of potato or corn starch.
And, of course, a Promatorium is where this would be conducted.
I've always planned on being cremated, but I've have lots of fun freezing things in liquid nitrogen and then breaking them (there are some nice perks when your wife is a chemistry teacher), so this seems like an interesting option. The first Promatorium has been approved in Sweden, but there should be ample time for it to be available in the US.
This isn't related to these guys...