yeah, the models in Mazzle are (to the best of my knowledge) proprietarily coded, but you can use something like ZMobDB to add similar models to your own UI.
there was another at wowace, but i can't remember the name off the top of my head...take a look around at files.wowace.com, you may find it (prolly in Interface Enhancements).
can't attest to its bugginess (or lack thereof) myself as i haven't used it since shortly after its initial release (when i stopped using model mods and went back to plain unit frames).