If I were to change US currency I'd do the following things.
1. Abolish the penny and nickel, they cost more than they are worth. Also abolish the quarter and create a .50 coin. Round everything up to .00 or .10
2. Abolish the one dollar bill, replace with a one dollar coin (we already have one) as coins last longer
3. Change "paper" currency to polymer model similar to Australia for longer lasting currency.
So you'd have dimes, half dollars, and dollar coins. Five dollar, ten dollar, twenty dollar, fifty dollar, and one hundred dollar bills. We'd save millions every year on this model compared to our current one.








