I seem to have missed this one when it came out in the summer, so, just in case you haven't seen it yet... Presenting Angry Birds - the theme! Not just a quick wallpaper job, Angry Birds the theme is surprisingly well done, as you'll see from the screenshots below. A fun alternative to whatever more serious themes you usually experiment with?
Here's 'Samy's theme in place on the Nokia E7:
Oh yes, very colourful - note the red bird mini-icon used to denote a running application 8-) And I wonder what the 'Search' application did to avoid being replaced?!
The theming (impressively) extends to icons even inside applications. Nice keyboard, if a little garish!
Oh yes... hit! The progress bar is an animated flying bird shooting across the screen.... and here's Madonna as you've never seen here before!