Now I bet you are all thinking I am going to do green for Ireland, but you would be wrong :-) A lot of people don't realise that in fact blue is the national colour of Ireland - St Patrick's blue. This is why the printed edition of the Constitution of Ireland has a blue cover, why the President's Chair is blue with a Celtic harp on it and why the carpets in the Dail and Seanad (Irish Parliament) are a deep blue.
No-one really knows why people started to think green was the Irish Colour. Of course the national flag of the Republic does have green on one third of it, that was to represent the older Gaelic tradition while the orange represents the supporters of William of Orange. The white in the centre signifies a lasting truce between the 'orange' and the 'green'.
This is a picture of St. Patrick's Hall where the Irish Presidents are inaugurated, not a hint of green anywhere lol. :-
Here is my St Patrick's Blue tile done today for The Diva:-