We helped our friends at CWS Studio to save, generate, and share custom user-generated labels designed for the famous hazelnut and chocolate spread jars.
We used server-side ffmpeg, a Gearman-like PHP queue manager, and fine-tuned the ImageMagick library for GIF generation.
The operation became quickly viral. Also, there was a leak of the banned words list (which we are not responsible for). Not a big deal, because everybody loves Nutella after all.