Photo Tile murals are made by using multiple tiles of the same size. For instance an 18 inch by 24 inch photo tile mural (see the image of the side of the barn below) can be made by using 6 inch tiles. It would require a total of -- 12 -- 6 inch tiles. 4 tiles across (24 inches) and three tiles down (18 inches) To calculate the cost of the photo tile mural, simply multiply the number of photo tiles needed by the cost of the tile you want to use. For the example above we calculated that you would need (12) 6 inch tiles to make a photo tile mural that is 18 inches by 24 inches.