I recently received a request to mosaic an existing mail slot flush in the wall with a colourful decorative cover to make it more attractive. I did some research and thought of the idea to design and cut a “postbox” shape out of wood and mosaic it in the traditional colors of the european post box that is so famous today. This would then be attached over the mail slot, and mail would be inserted via the cut out slot. This is a non-permanent solution and can be removed from the wall if you decide to move in the future. Brilliant!