This classic skull and crossbones image is available both as a full sized transparent png and a vector graphic.
I absolutely love this one, a pink skull and crossbones image that is decidedly girly and cute.
Here's a minimal, and I think oddly adorable image of the famous pirate logo.
If you're looking for a lighter, funny one, this one might be more your thing since it's a little bit silly and quite friendly looking.
A fairly traditional image of skull and crossbones associated with fearsome pirates.
Here's a smaller, stylized skull and cross bone clipart.
A simple but well made pirates image.
This cute skull and crossbone image is a bit larger than the other images, but I've left it since it's easier to resize down to fit a web page if you want to.
This one is available in black and white above and this one filled with a pretty pink...
The blank banners above and below this one can be filled with your own custom text. It's also available as a scalable vector graphic so it works well for printing!
I like this one a lot, it has a hand drawn, almost innocent quality to it!
Here's another traditional style skull and cross bone image, this time in black.
This crossbone has a cassette tape instead of a head representing music piracy.
This one looks angry, or maybe it's not quite human.
This last one shows the skull in side view with the bones crossed behind.