Photos of the famous

The 'working class hero' proving his arty credentials

Madame Marilyn

Kerouac

Ginsberg

Cher, Sonny and Bob

Some of these are interesting, though I'm not sure they're all 'rare'. Last one's in bad taste, however.

Plenty more here: http://www.cracktwo.com/2010/01/rare-photos-of-famous-people-125-pics.html