I made a set of trekking poles from carbon fiber golf club shafts from 5 wood metal drivers from Goodwill.
I sawed them off with Dremel tool cut-off disk.
I made handles from a kid's toy modeling clay-like product called Floam (TM). This consists of tiny polystyrene beads in a water-soluble binder.
I found the Floam on the kid's craft aisle at Wal-Mart. There were two cups, one orange and one silver. Net weight wet is 3.5 oz (100 g). You can see the finished orange handle in the photo. On the bare shaft, you can see the holes (about 3/16") I drilled in the to give the Floam some tooth to grip to. Each cup has just enough (about 1.75 oz wet) to mold one grip.
To mold the grip, I first kneaded the Floam to mix thoroughly. I formed a sheet and wrapped it around the grip. I then alternated squeezing with each hand. This made a symmetrical grip that I could use in either hand. If you'd rather, you could make one for your left hand and one for your right. Since my shafts were slightly different lengths, I opted to make them so either would fit either hand. I can then use the long pole on the downhill side of the trail. ;) It helps to spread your fingers apart slightly when molding. The Floam shrinks a bit when it dries. I hung the pole handle end down to dry. Every 30 minutes or so, correct the shape since it can sag a bit. It takes several days for the Floam to dry completely. It never hardens completely but dries somewhat spongy, very comfortable in the hand.
The Floam is not waterproof and might start to disintegrate if soaked in water. For this reason, I coated the handles with silicone sealer diluted with paint thinner (just like seam sealer). This didn't attack the Floam. The sealer gave them a nice grippy feel, also.
Finished weight was about 4 oz per pole before sealing. I'll try to get a more accurate weight and some field test results over the next couple of weeks.