There really is no hard and fast definition of a "blue blood", at least for me, as my approach is a little subdued. I do remember watching teams like Alabama, Notre Dame, and USC who were pretty good back in the day and are still pretty good now. Others, such as Nebraska, may have fallen off a bit, but given their wild fan base in Nebraska, I also consider them in that category. Purdue & IU? Not really blue bloods in football, but always fun to watch as you wat your teams to do well.