I bought the little chickadees when I visited Nova Scotia years ago. I snuck them into a wire cage. There is an old license plate from the 40's that seems to always make it into my decor. My twin sister found it at an antique shop years ago.
The plate with the dessert topper hold a mini ceramic pumpkin inside. I found those at various second hand stores. The filler is from the dollar store. With a few fungus picks interspersed.
So keep it simple yet interesting! Don't stress about the decor!