What you need: hard boiled eggs, large metal colander, white vinegar (1/2 cup for a dozen eggs; use 1/4 on 6 eggs), McCormick NEON food coloring, water and sink
*You might not want to do this if you have a white sink that stains.*
Place 5-6 hardboiled eggs in a large metal colander...they need some room to roll around, so do smaller batches if your colander is smaller. Splash with 1/4 cup of vinegar, then put one drop of food coloring on each egg and roll the eggs a little in the colander. Let set 30 seconds, then use a second color of dye on each egg and roll. Let set 30 seconds. Repeat with a third color if you want, but any more than that and the colors get muddy. After the last color sets for 30 seconds, lightly pour water over the eggs and let drain for 2-3 minutes. Put eggs on paper towels to dry.