First cut the top off of the green pepper. Pour some green paint on a paper plate and spread it around.
Press the larger part of the bell pepper into the paint, making sure all sides are covered. Have the kids press the pepper firmly against a piece of construction paper. After that they can add little lines inside to make it look more like a shamrock.
Add a little stem to the 4 leaf clovers and you're done! Let them dry! :)