Get a spool of string or yarn. Everybody playing has to answer a question of some sort (theme) when the ball of string is in their hands. Once they have answered the question they throw the ball of string to another player, but keep hold of the thread so it unravels and eventually create a web of sorts.
At the end, describe how the web they have created is analogous to the part we all play in life or in any group, and that if one person was gone it would look different. Likewise, it is important that we all take part to make the group what it is, unique and special.