"If you buy an urn or 'special' casket for a person, there will often be family-peer pressure to deal with at a sensitive time in everyone's life."
I disagree, your family loves you and if you want a Miami Dolphins Casket; you know... the pearl white one with the Teal n' Orange striped cross and a Dolphins logo on it? Then they will respect that and they'd probably have a good laugh remembering what a huge Dolphins fan you were and how many times you told them why Dan Marino IS the best QB of all time and that no other even compares. Then they'd remember when the Dolphins won the Super Bowl in 2008, Cam Cameron's first year as head coach. They'd remember how happy you were and how you reminded them, for the next 364 3/4th days, that THE MIAMI DOLPHINS ARE THE WORLD CHAMPS!!!!!!!!
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Nah, I think family would understand and appreciate a special Urn or Casket for sports fan dude.
Just my opinion though.