Many a mallow changed during the '90s and aughts. Anyone recall the pot of gold? That mallow made a debut in '94 but was replaced by the hourglass in '08. The blue diamond and yellow moon morphed into one blue moon (signifying the "power of invisibility") in '95. The shooting star replaced the original yellow star in '98 and represents the "power to fly." And the favored four-leaf clover became Lucky's four-leaf clover hat in '04.