I figured out an easy way to make a really light-weight camera mount (0.2 oz!) for my trekking poles. All you need is a 1/2" PEX plumbing pipe clamp, a 1/4-20 nylon bolt, and some JB-Weld. You can find all three at your local Ace Hardware.
Cut off one of the ears of the clamp and drill out the hole in the other ear large enough for the nylon bolt. Cut the nylon bolt to the proper size to bolt the clamp snugly to your camera, and then adjust the clamp to hold your camera in the correct orientation on your hiking pole. When you get it adjusted right, mark it and remove your camera, then use the JB-Weld to permanently attach the screw in that position on the clamp.
Turned one way, you should be able to mount the clamp in "portrait" mode on the handle end of a hiking pole, to form a "monopod". Turned the other way, you can also mount it "landscape" mode on the small end of your pole to take a picture of yourself, using your camera's timer.
See the pictures below.