Whether you need to cover a kitchen backsplash, redo the floor in your powder room, or pick finishes and materials for an entire house, tile is a big part of many remodeling projects. But walk into a tile showroom or home improvement store, and you may be overwhelmed with options. Cement or porcelain? White or off-white subway tiles? Glass tiles etched and painted with songbirds or a marble mosaic that looks straight out of Pompeii?