Historically, fireplace surrounds have been limited to modest sections immediately adjacent to the hearth. If you find a tile you like, you can use it to cover a whole wall (as in the case of feature walls). No matter how big or tiny, fireplace mantles can benefit from interlocking mosaic tiles. Ceramic tile is safe around open flames since it does not burn, melt, or release poisonous... https://www.buytilesandmore.com/blog/mosaic-tiles/how-to-design-a-stunning-wall-for-your-living-room-with-interlocking-mosaic.html