Yes, you can use doors made from recycled materials in your project. These doors are not only environmentally friendly but also help reduce waste. They can be made from a variety of recycled materials, including plastic, metal, or wood. Ensure that the recycled doors meet the necessary safety and quality standards for your project. It's also important to consider the durability and performance of these doors, as they should be able to withstand regular use and maintain their integrity over time.