General fall feelings/experiences:
* Falling (leaves, temperatures, etc.)
* Changing (colors, weather, moods)
* Crisping (leaves, air)
* Rustling (leaves, wind)
* Sizzling (fire, leaves burning)
* Browning (leaves, trees)
* Cooling (temperatures, air)
* Gathering (people, harvests)
* Harvesting (crops)
* Hunting (for game)
* Hiking (through colorful forests)
* Snuggling (up by the fireplace)
* Cozying (up for the colder weather)
Specific to nature:
* Leaping (frogs, squirrels)
* Burrowing (animals preparing for winter)
* Migrating (birds)
* Swarming (insects)
* Decorating (trees with fall colors)
For a more abstract feel:
* Longing (for the season)
* Yearning (for the season's beauty)
* Imagining (autumn adventures)
* Anticipating (the season's arrival)
For a whimsical or poetic feel:
* Whirling (leaves in the wind)
* Spiraling (leaves falling to the ground)
* Dancing (leaves in the wind)
* Glimmering (fall colors)
* Shimmering (fall colors)
Let me know if you want more words or have a specific theme in mind!