I love the idea of having the kids make Leprechaun Traps! Reuse items from around your house. Strawberry baskets, popsicle sticks, show boxes, etc.
Hwere are a couple that Liz made @ reCREATE. The "cloud" in the rainbow - is actually a strawberry basket covered with packing peanuts, and part of the trap!
Have fun, and good luck snaring a leprechaun!