Seamless tongue and groove installation All panels require profiles where they transition from wall to wall but some have them between each and every panel. This makes them watertight but they aren't great to look at. Starline wall panels use profiles in the corners but a tongue and groove system along the walls making it look like one large panel. It's a great way of keeping your bathroom looking neat and it's really easy to install. A Fantastic Tile Alternative Starline bathroom wall panels are a brilliant alternative to tile. Instead of the long process of tiling and grouting, which can end up being extremely costly, time-consuming and not to mention that they can become dirty easily. Bathroom panels are cost-effective and are also extremely practical, making them an .