Thanks Ross (and dirtyoldman). That was my initial thought as well. Seemed like U of I was overstepping here. But I'm not really sure whether I want to fight it because, as you mention, Hayden's estate or the photographer may have a better case if UI wants to bring it to their attention. It's also not out of the realm of possibility that I'd be applying for a job at UI at some point due to the nature of my work (not my Redbubble work but my work work)--so it might be best not to poke the bear here.
Kind of a bummer because this was initially just a fun way to celebrate the man (the myth, the legend), but what can ya do.