The countdown is an animated GIF. If you put it in as a background image, it'll run. The only limitation I've found is that it runs a certain number of frames and then restarts. So, if you have too many frames, it won't play the end.

I'm using that same countdown on mine, and I had to remove quite a few of the intermediary frames to make it run all the way through to the end. Looks fine, though, so no complaints. Just something to be aware of.