Yes, you can use aluminum strips to cover window or door frames. Aluminum is a durable and lightweight material that can provide a sleek finish to your frames. It is resistant to corrosion and weathering, making it suitable for both indoor and outdoor applications. Aluminum strips can be easily cut and shaped to fit the contours of your frames, and they can be painted or anodized to match your desired aesthetic. However, ensure proper installation to maintain structural integrity and weatherproofing.