As far as own, I'm limited due to experience and only having been initiated in 2006. But as (one of) the nerdiest at our chapter (Pi-Lamba, STLCOP), I've been able to get my hands on a couple things of interest to me.
- Purple, alumnus pyramid with crucicrescent embedded inside.
- At a conclave a few years back, I won on a trivia team and received a hardcopy of a history of Lambda Chi, which was similar to "a Historical Prospective".
- Autographs from several high ups during Centennial.
But for things I've seen in the fraternity, just most anything at Indy, including a painting or 3.