My inspiration gazing ball was found in Florida (the mecca of cool garden lighting and up green lights on palm trees). I went into one of my favorite garden shops Palm Harbor and found a simple gazing ball they stuffed with white Christmas lights. $40. I knew I could make my own once I got home.
I bought the gazing ball at Lowe's for $19 (blue ones in 2012, and my fav amber ball I found in 2011 sadly it broke last spring). I took the cap off of the gazing ball, threaded 100 white lights into the ball, plugged it into an extension cord, plopped it on a plant stand in my flower bed, and once it got dark, I had a beautiful glowing gazing ball in my garden! Several friends have done the same and love their gazing balls as much I do mine! Make sure the gazing ball is not opaque, and clear somewhat to let the white lights shine through.