There's a couple down here. One in the black and red air force markings, another in a wholly fictional scheme that'd look at home in Rhodesia were it not for the USAF insignia (if you can puzzle that out) and one down around San Marcos in the standard gray with the late-run bubble window on the pilot's side. I talked to the pilot for a few hours at an airshow in San Antonio several years back - he'd flown that exact bird with the 20th TASS out of Da Nang, then bought it when it as surplus postwar. Beautiful restoration job. Even had the underwing ordnance and that monster radio package in the back.
As an amusing aside, the nose art was (I think) Charlie Chaser, which featured Snoopy on his doghouse making a low pass over a cartoon VC. He said that was an original piece of nose art from the war. Charles Schultz sent them to the stencils along with a letter and an autograph, all three of which this particular pilot still had in his possesion. Said those were probably worth more than the O-2 at this point.
I have several hundred pictures around here...somewhere.
And my favorite fictional character was an O-2 driver...among other things. But we're still working on that.