I think that the Christmas Promo should be a disc that plays (for example) Jingle Bells. Also, you don't need a jukebox, you just right-click. Don't yell at me if it's bad. It's my first suggestion.
Unfortunately, this would require everyone on the server to download a mod since there's no jingle-bells sound file currently in minecraft.
I gotta say; it's a really amazingly epically boss idea. I always thought that minecraft was not special during the holidays, and I like to get festive around Christmas/Hannukah time. This would add a whole new reality to minecraft.
But if the player doesn't want to download it then it would be glitchy. And no way that we would grow popular by requiring a resource pack..
We could make it play the notes for jingle bells using note block sounds. That wouldn't require a resource pack.
..now that's not bad. +1But I think the item should be a clock that's renamed "Jingle Bell" in color and has all that tooltip stuff.
I'm pretty sure it's possible to do without any note blocks at all. Assuming 1.7 is done before the promo, /playsound <note> would be in 1.7.
Oooorororrrrr, the staff could make a video of each of them giving us holiday greetings and what notAnd the video could be called: Happy Holidays, From the EMC staff