Glampyre has a free Felted Bag With Skulls
pattern. If you didn't want to knit the whole bag, you could use the skull chart on a smaller project.
It shouldn't be too hard to punk-ify a pattern - that feeling really has a lot to do with colours. You could take a basic sock or mitten and change the whole feel by knitting it with high-contrast stripes of varying lengths and incorporating some bold fair isle/intarsia work.