Compact Theme

I’ve just upgraded to version 5 and I have to say I’m disappointed with the new look. There’s a lot of wasted space around the elements in the folder list, email list and everywhere else in fact.

And the email header in the message view panel is similarly wasteful. All I want to see (most of the time) is the sender’s email, the time it was sent and the subject. I would like to be able to switch off the avatar and reduce the amount of space it is taking up.

Any chance of a more compact theme, or even one which returns the look of version 5 to the look of version 4?