Rather than using background differences that we most often consider such as race or religion, consider creating discussion groups based on less divisive differences. Depending on your discipline and instructional purpose, these might include: only children versus those with siblings, those who played sports as children versus those that did not; those who like jazz or classical music versus those who primarily listen to current music, etc. Make the differences explicit as you create each group.
Remember that this is just an example of how to get started
with this Teaching Method.