NulledBB User Background

I hope I'm not in the wrong category, if I am I'm sorry. First of all, hats off to the whole NulledBB team, the forum looks just awesome. What I especially liked are these animated profile backgrounds. As far as I've noticed, the whole thing runs on myBB. Is this an addon, these backgrounds or have you coded this yourself?

I think they borrowed it from somewhere, but we must give them credit for such work

the forum is so well put together, plus i love going thru the discussions and seeing things that rlly make me think