I have to say I'm really impressed with some of these covers. Some of them are very stark and utilitarian. Pretty much like the novel obviously. (I've never liked bottom-right though. I always thought it looked like a bad album cover).
I like most of the Penguin covers here, apart from the one that looks like a doctor's waiting room. It's a bit boring. But there isn't a headless Julia, so that's something.
Then there are the slightly more colourful covers. Not too sure about the scantily clad woman though. It's more Peeping Tom then Big Brother.