Stability for round decorative balls
I'm a big fan of all kinds of shiny decoration balls: no matter if stainless steel, glass, mirrors: if it sparkles and glitters, it's mine.
If you do not keep them in trays, you quickly face the problem of rolling away, and I've solved that as follows:
Either I put it on a small ring (curtain ring for thin rods)
or
I glue a square of small rubber stoppers under the ball
or
I drip 4 glue dots with the hot glue gun under the ball
So they get invisible and do not roll anymore.