Thanks for the new link. My old one doesn't work any more.

It's hard to find, and they keep changing.

UK adult
http://www.bloomsbury.com/media/hp7a...h_complete.jpg

mini UK children
http://www.raincoast.com/harrypotter...hp7-lowres.jpg

Those are definately people in the background.
I think they're ghosts or shadows or whatever of dead people, who's ability to help is limited.