Zed are launching an Advent Calender for mobile phones, which a pretty cool innovation. For £12 ($22.80) you get a different piece of content every day, including ringtones, logos, jokes or trivia every day.
You can order the content depending on your mobile - colour and poly tones at one end, to black and white and mono at the other.
However, if you fall into the latter category, you should save your money and put it towards a new handset.
Story source: Net Imperative
Ha! I was two days faster
(http://www.gadgetguy.de/index.php/2004/11#Mobile_Advent_Calendar)
But thanks for finding one.