NCAA would be the biggest I think - A LOT of college grads, people who send money faithfully to their schools, etc. Imagine how many designs you would need though. At least 30-50 to start.
Yeah, I graduated from Ohio University (Bobcats) and I'd still buy an Ohio State University (Buckeyes) urn because I'm a fan of their Football and Basketball programs. NCAA brings alumni and sports fans into EI's target consumer group.