I think someone (Brian?) ripped a ridiculously priced Garret Rivas photo awhile back but mgoblue has some decent photo memorabilia. In the spirit of Notre Dame week, I'm seriously considering picking up this shot of "the catch."
As a fan of Michigan themed art work, I really like the work of Jan Kaulins, I have this in my office: http://www.jankaulins.com/p344.html
BTW, I'm not affiliated with either site, but I love quality Michigan memorabilia, if anyone else has suggestions re: same, I'd love to hear them.