I think this idea for a floor covering is fantastic. Pennies are placed heads up with a ‘goop’ glue to the floor. When all placed and ‘goop’ is completely dry a varnish was poured onto the pennies in several small layers until the varnish was a layer above the pennies and you can not feel the edges of the pennies. This took a lot of time to do and the installation artists did a great job. I do think it is illegal to destroy or otherwise make currency useless so before using any type of cash in your craft/art project please look into the legality of it. I really like how they used old and new. Don’t think because they used pennies that this was cheap. This floor costs hundreds of dollars by the time they were through. Looks amazing – but I would hate to see anyone in the future want to reno it and do something different. It would be a lot of work.