Mr. Jingles has a special Christmas costume. You can find it in the Google+ notification box: in Google+ and most Google services and in the Google+ app for iOS and Android.
Here's the animation that's displayed when you click the icon. This is the "retina" double-sized version:
There's also a reindeer version:
I like the alternative text for Jingles icons: "Jingles - Mascot of a bell with a smiley face".
{ Thanks,
Mukil. }
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