First, pumpkins for dinner. Stuff and bake dinner in pumpkins. You can do small individual ones; or larger ones for 2-4 people.
Fill with any stew, beef, pumpkin/pork, white bean vegetarian, or your favorite recipe.
Or, fill with your favorite chili. Chicken/white bean and, black bean are my favorite.
Any Fall soups are wonderful.
And, don't forget any rice, lentil, barley, couscous ... or any mixed grain dish. I love to add dried fruits, nuts; or roasted veggies to that.
Then, don't forget about using fresh fruit, or vegetables as flower vases. Oranges, grapefruit, various squash, cabbage, artichokes, corn, etc.
Obviously, I would used Fall flowers (some of these have summer flowers), mums, daisies, etc. And, maybe some fall twigs, acorns, dried fruits, pine corns, cinnamon sticks, and fall leaves. etc
SO HAVE FUN ... AND DON'T BE AFRAID TO WHAT YOU HAVE AT HOME IN THE FRIDGE TO USE AS A VASE.
So, use your imagination; and look around your house; you may be surprised what you have on hand.