This link has several ideas with tutorials:
I made several that you might be interested in, and here's my post - https://chascrazycreations.com/7-easy-garden-globes-gazing-balls/
here is a post which may help https://www.hometalk.com/17121358/garden-globes?expand_all_questions=1
You can also use old bowling balls.
Hi Robin, hope these help you
You could also purchase a bowling ball and paint it with metallic paint