At this time of year, filling your pockets with acorns and then putting them in small vases. Before you know it, you've got a mini-forrest. I tend to pick reeds and bring home, I think they are so decorative. And take care of any remaining apples. Make jam, dry them, bake. Make a wreath. Dry our cut flowers.
Another thing that has a great impact on my mood is to open up the windows. Whenever during the day. Listen to the bird song, the wind in the trees, the rain or the wind and just smell the scents.