Yes, black fiberglass tissues can be used to create decorative elements for exteriors. Known for their durability and resistance to weather conditions, fiberglass materials are ideal for outdoor applications. They can be molded into various shapes and designs, offering a modern and sleek aesthetic. However, it's important to ensure that the fiberglass is treated with UV inhibitors to prevent fading and degradation from prolonged sun exposure. Proper installation and maintenance are also crucial to prolong the life and appearance of these decorative elements.