A plant stand made of wood; wicker or iron with a luscious green fern is a gracious look. Why not use the foyer as a tiny art gallery? Designate an entry hall area or wall where you can hang paintings or pictures that are special to you. Hang a group of fine prints all framed the same. The prints will stand out more, if the color of the frames contrast with the wall color.
In a small foyer maximize the light and make a tight area feel less cramped with a floor to ceiling mirror. Your foyer may be a tiny space with only a coat closet and no place to hang a mirror. So why not mirror the closet door! This will make your space appear larger. Depending on how your closet door is positioned, it may double a gorgeous view of the outdoors.