… Oh all right then. I can think of plenty of reasons why not.
But if you missed the last post for Xmas cards and email is the only way you're going to manage to contact everyone before the 25th, then maybe you could jazz up your e-card with your very own animated GIF. Or perhaps you could use it to make a screensaver for your mobile phone.
JPEG files preferred, but PNG and (non-animated) GIF images should work too. Please keep the file size / image dimensions within 200 KB / 1200×1200 px, otherwise it will be rejected. Images wider or taller than 240 px will be scaled down.