Here's some stats from their blog ThePennyFloor.com
1873: the oldest penny used; coin features an indian head instead of Abraham Lincoln
1944: year of the WWII 440 steel penny used because of a copper shortage
59,670: total amount of pennies used
128: total number of man-hours it took to lay pennies
2: total number of people who made the penny floor possible
184: number of reruns (see glossary) placed before grouting
$596.70: total cost of pennies.
$2.55: total cost per square foot x 234sq = 59,670 pennies.
Thanks The Penny Floor for the photos and stats, love it!!