GMail “Terminal” Theme
Image by oceanic
GMail’s new "Themes" feature has a range of options, some disgusting, some lovely, including this "Terminal" one. The limited graphics seem to make this one really fast too.
If you can’t get access to GMail Themes, try going into your GMail settings and changing your Language to "English (US)", then logging out and in again. Google rolls out changes to their US users first, biased bastards! (not really, I love you Google, please don’t suspend my accounts