Back when I was in college I took a business class. We had to come up with a saleable product. My idea was lump o' coal for that rotten little kid. Back in days, St. Nicholas supposedly left a switch and a lump of coal in the stockings of kids who were naughty. So I would've had that info on the back of the packaging and shrink rapped to the front would be a piece of coal and maybe a picture of Santa or his sleigh.
Well, I never had the time to put it together in real life, I think I could've found a company to package up the coal but getting it actually into stores would have been a challenge. I think the dollar stores that have become so ubiquitous might have been the angle. Alas my idea never happened. If anyone wants to take my idea and market this go right ahead. I don't mind.