I do something different every year with my site designs come Xmas, and given that my workload is steadily increasing, I though it best to get things rolling now.
This year I spent a couple of hours fiddling with Flash and came up with the animated site header you can see above. The snow code was pilfered from a sample someplace (I had it on my iBook for a couple of weeks now, so I don't remember where I got it from), and I tweaked the ActionScript considerably before it looked anything like what I wanted.
There are a few issues with Applications/Safari, though - the DIV holding the site section tabs (Wiki, Photos, HOWTO and CVS) is obscured by what should be the underlying Flash movie (Hyatt, are you listening? ;)).
The remainder of the site has the usual rotating SiteHeaders, and I'll be testing this on other browsers during the week and making minor tweaks.
But no, this year I will definetly not have any reindeer. The antlers are a pain to draw...