I had a friend ask for a caution tape scarf because she had seen one being sold online. I checked online and on Ravelry and found knitting patterns: (http://www.ravelry.com/patterns/library/knitted-police-tape)
(http://www.ravelry.com/patterns/library/crime-of-fashion) …but none in crochet so I worked out how I wanted the lettering to look since I wanted it a bit different from the knit examples I saw and then graphed it out.