Every time my kids show any kind of affection ( like a BIG KISS) towards their parents or to each other, they get to take a shamrock from the tree and decorate it however they want it. They are having a lot of fun doing this.
Here's some other things I have done with my centerpiece tree in the past, click on the picture for more details:
And if you are still in the look out for a cute St Patrick’s Subway Art, then I’m sharing this with you :
Subway Art courtesy of Eighteen25