maybe they could do a current events and pop culture sort of podcast? they could discuss stuff from each week and give their opinions on it as well as relate it back to their lives? maybe they could discuss different uncomfortable topics people are generally curious about, but too afraid to ask or say out loud? or they could also discuss their personal experiences and how they've handled different situations or what different milestones were like in their lives. for example, discussing "first times" as a topic and they talk about the first time they did certain things good and bad and inappropriate.