All you have to do is to install the personas add-on and restart your FF.
Now you can choose different styles from the growing gallery or even create your own.
I tried this today. And this is, what I came up with. Hope, you like it :)
And no: This is not available for Download. I don't want to get in trouble with Oracle at all. I think it would be good idea to ask @oracletechnet (Justin Kestelyn) if you would like to have an official OTN/Oracle FireFox persona :)