I'm tired of pennies. If pennies were eliminated, the nickel could be revalued as 30cents and the quarter(Washinton's head) could be revalued as 1dollar. Dimes would be the lowest valued coins and everything could be valued in tenths of a dollar instead of hundredths. Vending machines could be easily converted. "Quarter Dollar" could refer to a 25 year period for withdrawal of the coins stamped with "QUARTER". Eventually, the 5dollar bill could be replaced with a 3dollar coin. 20dollar bills and 50dollar bills could be replaced with a 30dollar bill.