My father is a huge Islanders, Giants, and Mets fan, so I have rooms full of stuff.
Islanders- Mike Bossy autographed jersey, Trottier stick, Trent Hunter rookie card signed, Rick DiPietro Mask signed, photo with Alexei Yashin signed, and a few others.
Giants- Carl Banks signed Ball, Rodney Hampton signed game ball, Bill Parcells autograph on a napkin(interesting story), Ron Dayne signed Rookie card, and quite a few others.
Mets- 1973 signed Willie Mays card, Ray Knight autograph batting helmet, Ron Darling signed hat, quite a few others.
All I've ever gotten was a picture with Heilman and Bell, Carmello Anthony(while he was at Syracuse), and a ball signed by Julio Franco.