We don't usually feature passive audio accessories, but Kinetic Custom Machine's Sonastand 5 for iPhone 5 ($25) has some unique features that we liked. First, it's made from a single piece of aluminum, which contributes to a very solid feel. It's also available in multiple sizes, allowing it to support either bare or encased iPhones in a landscape viewing angle; you determine which size is right for your needs by snapping a photo of your case, then…