Gently place eggs in single layer in large saucepan. Add enough cold water to cover eggs by 1 inch. Cover. Bring just to boil on high heat. Remove from heat. Let stand 12 minutes. (Adjust time up or down by 3 minutes for each size larger or smaller).
Pour off hot water and rapidly cool eggs by running them under cold water (or place in ice water) until completely cooled.
Place several eggs in a colander in the kitchen sink. Splash eggs with vinegar. Drop yellow food color onto eggs. Gently shake the colander for a few seconds to help the color spread. Let stand 30 seconds. Repeat with 1 or 2 additional food colors, if desired. After the final stand time, lightly rinse eggs with water. Drain completely. Allow eggs to dry.