The olloclip Quick-Flip case for iPhone 5 is a great way to protect your phone and be able to use olloclip lenses.  The cases is a simple hard shell that has a section over the camera that flips away to allow you to clip the ollocip to your iPhone, but still keep it protected.  In addition to the case, included is an accessory that slides onto the bottom of the case and allows you to mount the iPhone to a tripod both vertically and horizontally.