Eat cereal? Get clothes as a gift? Wind up with those thin cardstock boxes from somewhere else? Own a utility knife or just a loose razor blade? Well then YOU yes YOU can cut a stencil. It really is pretty easy.
Step 1: get an image
First find an image you like. A quick web search for stencils should give you something cool to work with. Here we will use a Biohazard symbol because it is simple and I am lazy