maybe I'm just a sucker for a classy visual, but I just love these egg-shaped burial pods which can fertilise a tree after you're gone...
Capsula Mundi is a container with an old perfect shape, just like an egg, made with modern material -starch plastic- in which the dead body is put in a fetal position. Capsula Mundi is planted like a seed in the soil, and a tree is planted on top of it. The tree is chosen when the person is alive, relatives and friends look after it when death occurs. [source CAPSULA MUNDI]
This also negates the need for a formalised cemetery beside a church, you can just have a tree planted somewhere in the wild the way commemorative benches are sometimes set up overlooking a favorite view or nearby a favorite walkway or site.