A five-leaf clover, courtesy of L, photo courtesy of the Real Doctor. Extra lucky.
(Apparently, Occidentals are not the only ones to think that developmental anomalies in plants somehow portend good fortune. Rare double heads of rice were treasured as harbingers of good fortune by the imperial Chinese (e.g., with an interesting back-story). This makes a little more sense than the clover--with the rice, at least your bowl will be twice as full, but a superfoliar clover gets you nothing more than an incrementally more contented goat.)