This is such a cute idea and a great way to break the ice at bridal showers without playing any overly embarrassing games. You can customize the convo pebbles to your event and color scheme, and through July they ship for free.
The idea is that you scatter them on a table and guests pick them up and are supposed to and answer the questions to start conversations. Or for a shower, you can have the bride answer the questions on each of the stones. Cute, right?