If you enjoy gaming on your phone and happen to own a wireless Xbox controller that could be used for that purpose, then OtterBox's mobile gaming clip is an accessory you really ought to have around. It's a sturdy arm that attaches to the controller and presents a “floating” phone grip above the buttons, creating a kind of portable console experience that you can carry anywhere.

One nice thing is that when detached from a controller, the clip can act as a standalone...er, stand:

Get this well-made mobile gaming clip for $30 on Amazon.