It appears that Gmail is rolling out themes… The themes available (on a tab in the Settings menu) are:
Default
Classic
New Blue
Cold Shower
Steel
Minimalist
Green Sky
Bubblegum
Cherry Blossom
Night Shade
Marina
Dusk
Sunset
Silver Lining
Contrast Black
Shiny
Desk
Tree
Beach
Mountains
Pebbles
Summer Ocean
Phantasea
Graffiti
Planets
Zoozimps
Candy
Bus Stop
Ninja
Tea House
Terminal
Some of the thumbnails are too small to really give a good indication, but they will give you a general idea. Some of the themes are also [...]
Category > Tech News
Gmail Introduces Themes
The Value of Open Source Software
The original creator of Ruby on Rails didn’t believe in the necessity of RoR being threadsafe. Josh disagreed, and took things into his own hands.
http://weblog.rubyonrails.org/2008/8/16/josh-peek-officially-joins-the-rails-core
The world (or at least Rails developers) is a better place because of it.