I just started a new toy project for extracting Haikus from straight prose. It is currently in very rough shape and not very capable, but it is still fun to play with.

Choice examples from Emily Carr's "Klee Wyck" include:

Beaches Trees Held Back
By Rocky Cliffs Pointed Fir
Trees Climbing In Dark

Tipped Forward In Sleep
And Rolled Among The Bundles
The Old Man Shipping

The Sun And The Moon
Crossed Ways Before Day Ended
By And By The Bulls

Another example from Sun Tzu's "The Art of War":

Retained In Command
The General That Hearkens
Not To My Counsel

Watch the project on GitHub to see it develop.