This Easter egg project was SO easy. After you've hard-boiled your eggs, crack the shell without peeling it. Drop each egg into a sandwich-sized plastic bag, and squirt a couple drops of food coloring on it. Make sure it's completely covered. Add a few drops of vinegar (it will set the color). Leave the eggs in the bags for about half an hour. Peel carefully, but keep the shells! They are very pretty and can be used later. You can serve these eggs as-is, or make them into deviled eggs.