Yes, you can use an aluminum coil to make a flowerpot. Aluminum is lightweight, durable, and can be easily shaped, making it a suitable material for crafting flowerpots. To create a flowerpot, you would need to cut the coil to the desired size, shape it into a pot form, and possibly add drainage holes. Ensure the aluminum is cleaned and treated to prevent any potential harm to the plants due to chemical reactions with the soil.