This is kind of blowing my mind because I only knew one person who did this, back when I was a teenager, and she was from Sweden and I never knew quite what to make of it. I always thought it was some kind of idiosyncratic-- you know, I don't know what I thought it was, but she was cute and I had a huge crush on her so she could probably do whatever she wanted
http://www.neatorama.com/2014/05/03/The-Mondo-237-Collection/