If you are preparing for fall with a little festive home decor, the key to decorating is all about color. Autumn is all about warm colors during a cooling season, and that includes reds, yellows, shades of brown, orange, and greens. You don't want to overwhelm your home with warm, monochromatic colors, however, so keep the new decorations limited of they all match each other. If you're going for the complete look, you might also consider painting your walls a different color, as well.