I recently heard the last cantos of Shelley's Ode to the West Wind used at a funeral. How wonderful the lines were with their references to death, rebirth and the scattering of words and ashes in the wind, and how perfect for cremation or for a ceremony with ashes.
O wild West Wind, thou breath of Autumn's being,
* * *
Drive my dead thoughts over the universe
Like wither'd leaves to quicken a new birth!
And, by the incantation of this verse,
Scatter, as from an unextinguish'd hearth
Ashes and sparks, my words among mankind!
Be through my lips to unawaken'd earth
The trumpet of a prophecy! O Wind,
If Winter comes, can Spring be far behind?