Doubloons! Every year during Mardi Gras parades in New Orleans, the various marching groups, known as krewes, toss to the crowd aluminum coins called doubloons. Doubloons typically have the krewe name or insignia on one side, and a depiction of that year's Mardi Gras theme on the other. Paradegoers like to collect the doubloons, and some can sell for $25 or more on Ebay.