Spread some Irish luck and blessing to your friends in Ireland or any place in the world with these online greeting cards for St. Patrick’s Day! Your Irish pals will surely get jiggy with joy when you send them these Happy St. Patrick’s Day custom greeting cards. Customize our St Patricks Day greeting cards with a lucky shamrock, include an Irish blessing, or upload a photo of your friend dressed as a leprechaun and your card is good to go.