How's this for an idea:  We roll the dice (at least until they figure out how to control the thing), and if either of us has a flash of inspiration on that genre, we go with that one.  If we're both inspired, the one who hasn't gone as recently goes next.  If neither of us is terribly inspired, we see if we can hash something out together - or re-roll if it's a real muse-killer.<br/><br/>(I do have a couple shelves worth of table-top books and modules upstairs.  If things get really dicey, I can stand across the room and throw darts.)