This is a really easy and all natural way to make your home smell like fall. When I did this, it smelled like I had baked an apple pie in the oven. The family noticed right away and asked what smelled so good when they got home. They were disappointed it wasn't pie!
These are things you could simmer:
1 teaspoon vanilla extract
I used an apple, orange peels, and cinnamon.
Just put everything in a saucepan and add some water. Bring it to a boil, then reduce the heat to a slow simmer. Check the water periodically and add more when needed. Otherwise it will burn and it won't smell nice.