I'd carve a smiley face onto their head. Slit cheeks and butchered up eyes to really freak the detectives out then carve "Live Laugh Love" onto their body somewhere. With the time left over before I A) Get bored or B) Have to flee I would scrawl "enlightenment" around the house in pencil in odd places.
Finally I would cut a little smiley face into a random item around the house (toaster, kitchen knife, tall lamp) to show that it would be the weapon I'd use on the next victim and give the detectives an added sense of futility because I wouldn't want them getting bored or uninterested.
Because I'm lovely like that and may as well take my sweet time killing people ^_^
(Reading back over this it worries that all of this popped into my head when I saw calling card)
Finally I would cut a little smiley face into a random item around the house (toaster, kitchen knife, tall lamp) to show that it would be the weapon I'd use on the next victim and give the detectives an added sense of futility because I wouldn't want them getting bored or uninterested.
Because I'm lovely like that and may as well take my sweet time killing people ^_^
(Reading back over this it worries that all of this popped into my head when I saw calling card)