More to explore:
Fall Window Box #DIY #FallFlowers I do this with my planters and enjoy them right through November!
Fall Window Box fall transition
Pretty addition of mums, pumpkins & a burlap ribbon
DIY Autumn Window Box! So Cute!
Lovely window box of geraniums — The Yvestown Blog
Kitchen window box | greengardenblog.c...
DIY Window Boxes for Flowers
15 Cool DIY Window Boxes With Tutorials | Shelterness
Fall Window Box
Roomy window boxes - a wise investment that yields fabulous results - article/window boxes by the very talented Deborah Silver
Cute idea for planter on front porch, could change decorations for each season/holiday
I think this might not be as much work as flowers since you wouldn't have to deadhead them. And it's beautiful.
The Philly Home Blog: Fall Window Box Ideas I will be doing this to the window box on the garage.