Fall foliage is a great way to decorate the room. Over at our Science/Sensory table my co-teacher made a tree using brown paper bags. She strung some leaf cut-outs along the ceiling near there and got some leaves from the dollar store to add to the tree. They were real leaves covered with wax to preserve them. We placed some in a bin and then had another bin next to it with some small pumpkins and gourds. Make sure you check for any allergies before bringing things like that into the room and check them daily for cracks and rotting.
My co-teacher also made this great pumpkin counting activity. Sometimes the simplest additions to the room are the best. The kids counted the three pumpkins and even started placing the small pumpkins we had on the table on top of the pumpkin cutouts and counting those pumpkins too.
Another great enrichment that the children loved was this little carrot picking toy that I made. The bottom is a saltine box covered in brown paper and of course contact paper. I cut three holes in it and then made some carrots using toilet paper rolls, construction paper, felt, and pipe cleaners (the pipe cleaners are what is holding the leafy green part up). I hot-glued it all together, added some numbers and contacted the bottom part of the carrots. The children counted those carrots all day long and the toy was well-played with for months and it only took about 30 minutes to make.