She meant a piece of gold.
Looks a little Roadrunner inspired :)
Some other ideas:
1) A leprechaun over time-what are they like when they are young, what kind of jobs can they have when they grow up?
2) Perspective of the leprechaun's gold-how does it feel to live at the end of rainbow and be hidden all the time? Perspective of a shamrock, compare a 4-leaf clover to a regular one, does the 4-leaf clover feel a little more entitled?
3) Where do rainbows come from? (not exactly St. Patrick's Day, I know)-encourage them to come up with a creative reason for them. When we did this activity one of my students said it comes from crayon factory pollution, another said fairies paint them in the sky.
4) What 3 wishes would you ask for and why?
5) Design a new good luck charm.
6) What would a leprechaun's Facebook status updates look like? (yes, even my young kids know about FB).