As tattoo designs and symbols, the shamrock and four-leaf clover are very popular with Celts of Irish descent. In fact it is hard to imagine a St. Patrick's Day without Shamrocks and Four-Leaf Clovers to accompany Leprechauns and green beer.
The Shamrock and Four-Leaf Clover are universal symbols of Ireland all over the world, a symbol of being of Irish descent and in the case of the four-leaf clover, a potent symbol of luck or good fortune. Interestingly enough, both shamrocks and four-leaf clovers are one in the same - with a crucial difference - and have a symbolic tradition that goes back many thousands of years, spanning both the periods of the Druids, the Celtic Tribes and the modern era of conversion to Christianity.
The tradition of wearing Shamrock on Saint Patrick's Day can be traced back to the early 1700's. For good luck, a Shamrock is usually included in the bouquet of an Irish bride, and also in the boutonniere of the groom.
See also: Flower & Plant Tattoo Index, Four Leaf Clover, Irish tattoo designs, Celtic designs.