The link doesn't give directions ... but this would be so easy to do with a Sharpie. Buy inexpensive stick-up pop lights at the Dollar Store, draw your design on them, and stick them up around the house or near your front entrance! Great idea for Jack Skellington or non-Disney Halloween characters (like "generic" ghosts) too!
I first saw this idea on Pinterest (of course) LOL and can't believe how different you can make these plastic knives look! Between Dollar Tree and Dollar General, I found at least three or four different kinds of knives to grunge.