While you celebrate the Irish in you, and enjoy all things green, I though you might also enjoy a fun version of the story of St. Patrick. He was actually one of the most important missionaries in early Christianity, and his story of faith is amazing! This is Veggie Tales version of the story, so it would be a good thing to gather the kids around the computer and watch it together.
Our almost-3-yr-old daughter has watched this enough times that I was readily able to answer when someone asked what the story of St. Patrick was.