I've visualized each of the Bitcoin "B" designs as described, set against an all-white background. This approach highlights the unique features and artistic details of each piece, emphasizing their individual themes and materials. The transition from the textured and traditional wrought iron to the vibrant and playful pipe cleaners showcases the wide range of creative expressions within the theme of Bitcoin. Each piece stands out distinctly, offering a visual journey through different interpretations of the iconic cryptocurrency symbol. If you'd like to explore further or have additional ideas, I'm here to help!