Skull Painting References

[reckoning]

I want to attempt painting skulls on helmets and bare heads. Any recommendations on references for simple skulls? Google image isn't really cutting it, though I could be looking for the wrong thing.

[Khulu]

Xenith made a pretty good tutorial for knee pads right here, not sure if this is what you mean (or if you mean painting helmets to look like skulls).

[Xenith]

You can also vary the colours to get stuff like this:

Done in the exact same steps as my tutorial, just with black instead, then red for the eye and nose holes.