My favorite local tree model was looking stellar on this morning in the early light. (Early being relative on a retiree clock - it was captured about 10:30 in the morning). Normal color and processing.
A black and white version with a little infrared processing added which lightens the greens and shadows.
Lastly, a black and white version with some pen and ink effect and high contrast processing added to darken the greens and shadows. I think any of the three would make a decent cover for a spooky book.