Step 3: Mosaic a Bowling Ball
There are a variety of adhesives that can be used, based on what type of material you will be applying to the ball. I find that thinset mortar, construction adhesive, clear silicone or premixed concrete patch work for most things. Mac Glue, Plumber's Goop and Silicone work well for glass. Make sure you have proper ventilation when working with glues, following the manufacturer's instructions.
I used Plumber's Goop to apply these glass globs to the ball. The ball was already a pretty bluish-green color, so I did not feel the need to paint it first. I did not grout it.