Weather to change the look of your site
Using a little magic and trickery (read: PHP and CSS), we can change the appearance of a website automatically based on the weather outside, in real time! In the example site the header graphic will change to one of four different styles based on Sunny, Rain, Snow, and Cloudy.
Read the complete (very cool) article here ;
using-weather-data-to-change-your-websites-apperance-through-php-and-css