Oh my! I just discovered the old threads with tutorials! I'd never seen them before! I love all of the bowling balls you all have made, and hope they are all still in your gardens after all these years!
This is the only one I've made, but if I can find more thrift shop bowling balls, I'll make more.
I used lots of plain glass tiles, glitter tiles, tumbled glass and glass gems. It's been outside near my front door for almost 10 years now. I've only had to replace one tile that fell off one winter when it was freezing a lot.