Glass toys are not dangerous. If they were, they wouldn't be so popular (or expensive, in some cases). It takes extreme changes in temperature or a drop from high up onto a solid, hard surface for them to break. Even then, they don't shatter, they just break into pieces. Then you sweep it up and throw it away.
For what it's worth, I intentionally dropped my Icicles No 17 onto a hardwood surface many, many times and it didn't crack, break, or chip. It's perfectly fine.