This project is shown in Spring colors, but I see not reason why you could not do them in Fall colors.
Make a matching set of vessels by painting metal cans in muted hues. Here again in Fall colors, like browns, gold, rust colors.
They refinished soup, tomato and coffee tins in assorted sizes, and fitted them with drinking glasses to prevent rusting.
Smooth any jagged edges with a metal file, then apply 2 coats of a semi gloss latex paint . Then insert a glass into each container, fill with water and tuck in your flowers.