Add pizzazz to your yard or garden by placing a finial on each posts of your fence. Finials are decorative tops added to already existing fence post caps. Some finials, such as plastic ones, have a base that can protect the post top and are installed by simply setting them over the fence posts, while others are attached with screws. They come in a variety of shapes and sizes that include points or spears, such as you would see on old-style wrought iron fences.  Finials are a great way to add dimension to your fence, whether you have cast aluminum, wood or wrought iron as your fencing choice.