I saw some fantastic "Temple Bells" at a local garden center that were made from welding tanks. I really wanted one, but didn't want to spend $350 to get one.
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.