I made a list of the weirdest and most received morning show topics in 2007 while at KHGE Fresno. Although they represented Fresno, they give you an outline of what would work as phone starters for morning radio on a Country Music Radio station. The topics ran from guys pissing in the yard because they didn't want to come into the house to fighting with neighbors.
We learned this at WCTO Allentown with the now infamous Ken and Kitty morning show, any thing that involves family, that is sublime and weird gets the phones going. I remember the day I told Ken, "You need to be talking about the gay councilman scandal in Philadelphia". Ken said we tried and they responded to a burning box on Highway 22 in the middle of the fast lane. I never tried again to insert topic suggestions.
Never try to force fashion - Let the morning show audience guide the topics and interactions. Kevin Metheny once told me "Great phones beget great phones." Once you get them going, it takes off. How you interact with the callers is most important. If you come off flippant or inside, with announcer pabulum, then it doesn't make an impact. You can't use weird topics and try to rise above the street level, redneck of it. You then need to share a story or life style injection of your own.