Modified skeleton heads (yes, I know they're called skulls, technically) from Link to the Past. I've already spent a fair bit of time detailing and recoloring the skeletons to make them look a little more "lush", and I used one of those (recolored again), and attached a jaw to them.

The jaw was important to make it feel like an Olrox attack. The little skulls Olrox could summon had opening jaws, so even though the original Zelda sprites didn't have them, I had to modify some on.

Don't look too bad, if I do say so.
 
    

When evil spreads across the land, and darkness rises and the monsters roam. When the creatures of the night make beautiful music, and the things that go bump in the night go bump with greater enthusiasm. When the world is in peril and is in need of a hero...

These guys are, sadly, the best the world can hope for. These are the adventures of the heroes of CVRPG. They mean well, they try hard, and occasionally they do the impossible...

They actually do something heroic.