ideas for a new form of U.S. currency?

[Zarxrax]

The bills all have different pictures and each contain large numbers with their denominations. There is literally no way for a sighted person to confuse them.

Actually it's quite easy to confuse them, especially if you are in a hurry. I know I have accidentally handed a cashier a stack of $1 bills and a $20, on at least 1 occasion, thinking I was only handing her $1's, and I know tons of other people who have done it as well. Unless you stop and actually examine every single bill, it's really easy to get them mixed up.