Sometimes, being portable is more important than carrying a proper camera mount or tripod. Instructables user corybschneider came up with a stable, secure mount that's adaptable, mounts anywhere and can be used with one hand. All you need is a clamp and some assorted screws and nuts.
It may look a little unsteady, but the end product is solid. The clamp serves to keep your camera in position wherever you place it, and the double brackets, joined by a few screws and nuts, gives you the flexibility to position your camera in any direction. This particular walkthrough is designed to use a camera's standard screw mount, and if you don't like the look of the double-arm there in the centre, you can always adapt the mount so there's a single screw.
Perhaps best of all, you can make the mount from items you probably have easily available, either in the garage or with a quick trip to the hardware store. You won't need special tools either beyond a drill, a screwdriver and a good rotary tool. When you're all finished, you'll have a camera mount that can support most medium-weight cameras and lenses, and can be mounted just about anywhere a clamp can be securely fastened (which is a lot of places.) Hit the link below to see how it's done.
One Handed Clamp Camera Mount [Instructables]