Photo-sharing site Flickr revives their Santa Easter egg for the holidays, which adds a beard or hat to any photo with the right note text.
Add a note to your own (or someone else’s photo) with the text “ho ho ho beard” or “ho ho ho hat” (no quotes) to superimpose a re-sizable Santa hat or beard on any photo, as pictured. For more like this, see our top 10 software Easter eggs.