I only used black and white polymer clay for this one.
Make a cylinder of white clay that is two inches wide and one inch deep. Cut it in half using a razer and push two indentations into the flat edge for eyes.
(Ignore the little rectangle cheeky bits, I ended up not using them.)
Put worms of black clay in the pencil indentations and cover the flat edge with a 1/2 inch sheet of white. Cut a triangle shape in the middle of where the eyes are and fill it with a triangular worm. Cover this with a 1/8 inch sheet of white.
Make five or six rectangular worm shapes that are about an inch long. cover every other one in a thin black layer. Stack them together and cover any white edges with more thin black. put them where the teeth go under the nose.
Pack black pieces into the cheek area and under the teeth. try to make it be roundish when done like the top of the skull. You should have a cylinder again with a skull inside.
Try to maintain the same thickness all along the cane as you go. Cut the cane to more manageable lengths if you need to.
You can make it as thin or as thick as you'd like. I made mine for nail art so it's about a 1/2 an inch thick.