I just came from the tile company where they laid out about sixteen tiles in the one I thought I wanted, not going to work - then I eyed one I liked a lot but it has the pit holes in it....Have you had any experience with this. I want to put 24X24 tiles in the bathroom with smaller herringbone pattern of smaller brick in the water closet. Should I fill the holes with grout or leave....I just think dirt in the holes would drive me nuts. Your advice....