I love it when something you loved as a child (but has since disappeared) reappears. I could never remember what these guys were called, but when I was younger, I colored in Mr. Men Little Miss coloring books. With my wonderful scented markers. I liked them all except black (which was scented black licorice). I think I also used to have Colorforms for these guys, too!
Seems like there is a resurgence in popularity for these items. They have a website and other folks are selling stuff with their characters, too.