Since I still don't own a GoPro, I record the few videos I made with my phone. But I needed a kind of tripod tool to hang it and simply choose the right point of view without keeping it in my hand.
So I made a quick and dirty thing based on a pocket camera tripod, a mobile phone case and a C-clamp. The hole thing costs me around 20€.
I found this idea somewhere on the Internet but I can't remember where. When I find it I'll add it here.
After finishing this video I found a second method to do this that is simpler and works with every model of phone. If I need to do a second one I think I'll use this system.