Seasonal decorations can get expensive! Here's a nice idea we did here that can cost you next to nothing: bring the outdoors in. DH and I ran off to the mountains to get these leaves (the Alpine Loop is breathtaking this time of year), but all you really have to do is just step outside.
Gather some pretty, colorful leaves and dry them between two pieces of newspaper for a couple of days. Arrange them in an inexpensive frame, using tiny pieces of glue dots to mount them on cardstock. Voila!