I know it's a little wordy, but I would love this quote by NDT to appear on my tombstone:
"I would request that my body in death be buried not cremated, so that the energy content contained within it gets returned to the earth, so that flora and fauna can dine upon it, just as I have dined upon flora and fauna during my lifetime."
What do you want on yours?
I haven't found one better than the old classic: "I expected this, but not so soon."
"Non fui, fui, non sum." I was not, I was, I am not.
Here I lay in a hole. My next best friend may be a mole.
...and everyone lived happily ever after.
Shorten it, perhaps to "What I dined on is now dining on me."