What about the Nirvana unplugged album? or Bob Dylan? My missus can't play guitar, but she can still throw out some Dylan tunes....

Knocking on heaven's door springs to mind.... G'NR version might be more contemporary, and it's got a relatively easy lead... and while on GNR, 'Don't Cry' is all open chords isn't it?

Oh, and 'Wonderwall' or 'Live Forever' by Oasis - irritating, but easy for a total newbie....