These free, printable shamrock coloring sheets provide hours of online and at-home fun for kids during the holiday season. The shamrock is a symbol of Ireland. It is a three-leafed old white clover. The four-leaf clover is often confused with the shamrock. While the four-leaf clover is a symbol of good luck, the three-leafed shamrock is mainly an Irish Christian symbol of the Holy Trinity and has a different significance. It is also a common way to represent Saint Patrick's Day.