I worked for a while at Harbor Freight as a retirement job. The blankets were a great deal.
They use to stock them in a very nice red color as well. Those may have been discontinued. I picked up a few for as little as $8 each when they were running specials.
The blankets are not very heavy duty, and are lightly woven, so I think they could be used fairly easily as cloth. I swear, the green ones use to come in a package that labelled them as a "moving blanket."
They are somewhat smaller than a regular size blanket, but are just right for one person.
If you buy one, you should immediately open up the package and inspect the blanket. They are so loosely woven that at times, some would turn up with a "thin spot" in them, that you could practically see through. If you get one of these, walk right back in the store and they will happily give you an exchange or refund.
Best, Mannyrock