Here’s a quick userstyle for the Gmail loading screen. You and apply it via Stylish. Edit: And a Chrome/Chromium extension!
It’s takes you from boring…

Gmail Loading Screen (Before)
…to moderately less boring!

Gmail Loading Screen (After)
It’s cool how just centering the info and adding a logo spruces things up. Take the hint, Google!
Here’s the code:
@namespace url(http://www.w3.org/1999/xhtml); @-moz-document domain("mail.google.com") { #loading { position: absolute; left: 50%; width: 400px; margin-left: -200px; } #loading .cmsg:first-child { background-image: url(https://mail.google.com/mail/images/2/5/logo1.png); background-position: left top; background-repeat: no-repeat; padding-top: 70px; } #stb { left:0px; } }
Ideas to make it cooler? Leave a comment!