Sarah Jane Smith
Being pretty late to the game when it comes to Doctor Who, I wasn't able to see much of Elisabeth Sladen when she was with us, though it's quite possible I saw her with Tom Baker on PBS when I was a kid. If you judge a person by the way others speak of them when they're gone, you'd have to say she was one special lady.
Oh, and the Andy Pandy outfit? I think it's fantastic :)
On another note, Wes at the Who-centric "Omega Podcast" has come up with another great wallpaper;