Changing your inside environment to match the outside environment is the best way to keep a fresh new excitement to your house. Take the beach towels and put them away and bring out some warm colored pillows and throws. Light a warm vanilla sugar candle to set the fall mood (or whatever fall smell you prefer, it's your nose that has to smell it, not mine.) and make some warm yummy soup with some loved ones!
During the day, the windows can be your best artwork, open the blinds and crack the window a few inches to smell the fall air and see the changing leave. Incorporate as many warm colors into your house as possible. Fall = Warm colors, the opposite of the temperature outside (rule of thumb for all seasons).
Enjoy this beautiful season and bring it indoors, its super easy and gets you in the spirit of fall, y'all!