We did a cupcakes set based on this theme ,
here is some research from this topic
" The four leaf clover is a widely accepted symbol of good luck with its origin dating back to ancient times. The Celtics believed the four leaf clover was a lucky charm which warded off evil. Saint Patrick then used the three-leaf clover, called the Shamrock, to preach on the "Holy Trinity" to the Irish. The popularity of the Irish four-leaf lucky clover (Trifolium Repens) spreads and today it is universally accepted as a symbol of good luck; not only in the west but also across the world. On average, there are 10,000 three leaf clovers for every instance of a true four leaf clover. The leaves of four leaf clovers are said to stand for Faith, Hope, Love, and Luck. It has been known that whenever one finds the four-leaf clover, "something good always happens".