Stone and wood, can't get more natural than that!
I have always been a sucker for a collection with a theme. Spring brings so many shades of green.
Stumps are pretty cool. Grass tuffs.
Evergreens can be blue too! I never get tired of seeing Denver's blue sky.
One of the great joys is to see, hear, touch, and smell the yellow aspen leaves in the Fall. It is where you are that is important.