CSS for the Pal calendar
One day I found out that the calendar application I use, pal, does not support different cascading stylesheets for different event categories when exporting the calendar to HTML. This patch does the trick. (Right, it's an ugly hack, but it works. :-))
The classes of the different categories are named "category-?", where the '?' is to be replaced by the number of the category. The categories are numbered according to their appearance in the pal.conf configuration file.