Low/No Cost GoPro Accessories!

Around Christmas I picked up a GoPro Hero 3 Silver. Much to my dismay, it used a proprietary quick-disconnect system. Options? Spend a bunch of money on proprietary mounts, or kit-bash as much as I could to re-use my current camera accessories. Obviously, I went the DIY route. Each of these mounts cost under $10 to build, with little or no tools.