A few months ago, I came across an Instructable on making a compressed gas cylinder wind chime: http://www.instructables.com/id/Compressed-Gas-Cylinder-Wind-Chime/. Using it as a starting point, I started working on my own.
It turned out pretty cool.
Step 1: First Steps
I researched the length to diameter ratio of temple bells and found that most of them were approximately 2:1 length to diameter.
I cut the bottom of the bottle a little at a time until I got close to a 2:1 ratio.