I do believe the code is on the wowi svn, dunno how up to date it is though ;)
I blame Obble!
...though I readily admit I am guilty of peeking in the cookie jar. I tried that version, then decided I'd be happiest trying to make my own layout. It's currently just a slightly modified oUF_Lyn, but I get a ton of inspiration from trying out other people's layouts and then seeing how they approached certain elements.