My favorite piece is my Charlie Manson. Provenance is documented. You can see sig and swastika in bottom corner. He lost all his art privs in prison a long time ago, so he cannot produce any more than what is already out there.
I also have numerous smaller sketches done by serial killers. Such as Gacy and Fish. Tend to focus on the child killers. My girlfriend finds it disturbing and refused to enter the office if I put it on the walls. I also have a James Ear Ray (shot MLK) original piece that was later turned into a lithograph. A very piss poor drawing of a Vietnam battle scene he was involved in. Child killers make terrible artists believe you me.
I also have a small growing collection of Orthodox Icons. This is my favorite piece. Very dark. Love it. Dates to the mid 18th century, Czech. Stole the rosaries from the Shrine of St. Theresa.
Favorite artist that I dont own any of. Monet.