Check out these simple ideas:
Make a Shamrock Shake for breakfast: Blend one banana, 2 cups of lime sherbert, and 2 cups of milk!
Magic Milk: Add a few drops of green food coloring to the bottom of the glass and add milk!
Golden Coins: Use Ritz crackers, peanut butter, and butterscotch chips. Spread the peanut butter on one Ritz cracker, top with second cracker. Melt the butterscotch chips and dip the sandwich crackers in it to coat, and place on wax paper.
Shamrock Mashed Potatoes: Prepare mashed potatoes and have the kids add a few drops of green food coloring. On their plates, let the kids play with their food and make shamrocks out of their mashed potatoes!
Leprechaun Dust: Use one box of Jell-O instant pistachio pudding, milk, and empty, clean baby food jars. Place one tablespoon of the Jell-O powder into the baby food jars, and add milk to fill the jar. Have the kids shake it up to turn it to green!
Serve a Green Buffet: Grapes, pickles, olives, cookies, cupcakes, kiwi, green apples, celery, broccoli, cucumber, pear, green Jell-O and pudding, sour apple jelly beans, etc.