$.02 or less becomes $.00, $.03 or more becomes $.05.
The change (pun intended!!) would hardly be noticed.
This is funny because I remember just a few years ago reading about how the Mint would never stop making pennies because they made a profit on them.
The military exchanges in Japan started rounding to the nearest nickel this about 10 years ago when the cost of shipping pennies there grew too great. I didn't miss them at all and when I returned to the States, I found dealing with them again very annoying.