This one is in progress, but I have an oddball phone with minimal after market for cases, mounts, etc. The universal mounts are all either too small, to bulky, or so flimsy, a pothole will send the phone sailing down to the floor. Then I came across this $10 "selfie stick"...
Hmm, that looks like a pretty decent clamp at the end for the phone. After all, people use these things to dangle their phone as off cliffs, roller coasters, and what have you. I brought it home and stuck my phone in it. Shook it around quite a bit, and it stayed put. Cool beans.
*yoink*
It took quite a bit of coaxing to get the phone clamp part off the telescoping stick, but it came off nicely. Now to sort out a cheap but sturdy base for it.