I just throw all my clippings and leaves in the fall on my garden and just let the pile sit. Basically the worms in the environment have at it.
Each year the pile(s) are in different places in the garden so it's always shifting so the worms are fertilizing my garden.
I mean passive as a pile also as I don't necessarily turn my piles so it's not an active compost pile.
In a nutshell, it's like finding a pile of old leaves on the pavement. When you disturb the pile after it's been sitting for a long time, you'll find worms in it.