Queen, that most chameleon-like or even dare I say it 'mercurial' of bands (damn that pun and the horse it rode in on), was as tough to pin down visually as they were musically, following trends or even creating them as quited their whims. Yet they were markedly image-conscious, and that's an important part of their - or, to be more specific, of Freddie Mercury's - legacy. From groundbreaking early music videos to live performances... and the album covers themselves. Like the album contents…