In 2012, I decided to use pennies to tile my bathroom floor.
It took a little over 5,000 pennies to cover the floor. The pennies were covered by a two-part epoxy-resin to seal them and provide a shiny finish.
All the pennies are face up and facing the same direction. In case you are wondering, the pennies are facing away from the toilet, so Abraham Lincoln is not watching using the bathroom. After all, privacy is important.