I wanted to try the garden gazing ball DIY so purchased a bowling ball from a thrift store, flat glass marbles , E6000 glue, silver metallic paint and spent a few days making this.. I have gone through multiple versions and lessons learned.. I liked this project so much that I have purchased thin-set mortar to use for the next one.
7-21-19 update. A little over 1 year - the hot GA sun did a number on the E6000 glue and grout cracked and beads fell off. Definitely going to use mortar as the glue for beads and adjust spacing to see how will hold up. Hope to finish end of August 🤗 (see last image)