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If you don't have any lying around the house, you can look for them in a building reuse shop. Rinse a brick and leave it to dry. If you have a very heavy door, you may want to use two bricks for this project. You can use one color or several colors for a more intricate felted pattern. It will tighten as it dries. Place in front of your door when it is completely dry.
Find an old brick. Purchase wool roving in colors that match your home decor. Place it on a wire rack to dry completely.