I found a pattern for a Knitted Skull and Crossbones Cloth on the web, by Rhonda K. White. Here’s a link for you:
As you can see, the image is broken so you don’t know what the dishcloth actually looks like. So I’ve taken a picture of mine with the hopes that it might be useful to someone else. It’s a little hard to see since I use a much bigger size needle than recommended, and the gradient doesn’t help, but it’s better than no picture at all.