I don't like paper money. We should phase it out and replace it with coins. Get rid of the $0.01, $0.05, and $0.10 coins and add some new ones. Like, we're overdue for a $2 coin, Canada has had one for ages. We should also have something worth more than that, maybe a $10 coin or something.
For really big purchases, you have checks and cards. I understand checks and cards. They're just a fancy IOU, a physical representation of "I'll have my bank send it to your bank." They can be whatever the hell you want.
But cash? Cash should be made of metal. Paper cash just feels wrong. It's not heavy enough. Cash should be heavy. Except at strip clubs, but even strip clubs have started moving to the $2 bill so I think we're overdue to ditch the $1 bill at least.