If you are interested in ui design for the web, http://paradigmpop.com/blog/diwant/2009/08/26/ajax-context-and-color-red

That new Mac commercial sells PC very well (you know, the one where the PC guy is wearing the Mac guy as a disguise)

It is raining outside. It is raining in my Gmail theme. Why would they want to put depressing weather in a theme?