"Just found out about"? Oh my god. I was drowning in those things when I was little! My grandma had a HUGE bucket of them, my friends in the same village had a bunch, they had them in the pre-school place I was in, and they had them in school for the first two years... And the last time I used them was... two years ago. At school.
But yeah, can be kinda be used as pixel art.