Peel the hard boiled eggs and slice in half lengthwise. Scoop the yolks out into a medium bowl and reserve the whites until needed.
With the back of a fork, mash the yolks until smooth.
Add mayo, onions, parsley, mustard, salt, paprika, and garlic powder. Mix well.
Add a few drops of blue food coloring to turn the yellow mixture a soft green.
Spoon green yolk mixture into the cavity in each white half, dividing evenly.
On top of each yolk filling, place one black olive slice. Add a small piece of pimento or red pepper for the pupil.
With a toothpick dipped in red food coloring paste, draw red veins on egg white's surface.
Cover and chill until ready to serve.
