Reddit user toooners made a floor completely covered in pennies. It took about a month because of some trial an error. They ran out of tarnished pennies at one point, so that had to be artificially done. I can’t notice the difference between the naturally dark brown ones, and the tanned ones, I’m sure though that had I spent all the time making the floor, I would.
The room itself doesn’t look that large, but this is a time consuming process. Especially once you look more closely and realize that all the pennies are placed in rows of heads, than tails, and all of them face the same direction. It’s nice, dedication to the cause, I like it.
Check out the entire Imgur album, it’s quite a ride.