We recommend to use outside tile corner trims since they are easy to find and can make a perfect match to the finish of your kitchen/bathroom appliances. These moldings available in various metal finishes from polished/satin chrome to brushed/polished nickel. They are approximately 8 feet long which is perfect to create a seamless edge. L-Shape tile trims available for sale in big-box home improvement chains and some local tile stores. On the other hand you may use half-round glass pencils but they are still hard to come by. Thank you!