Place all of the eggs into a large pot so they can rest on the bottom in a single layer. Fill with just enough cold water to cover the eggs. Bring to a boil, then cover, remove from the heat and let stand for about 15 minutes. Rinse under cold water or add some ice to the water and let the eggs cool completely. Peel and slice in half lengthwise.
Remove the yolks from the eggs and place them in a bowl. Mix in the relish, mayonnaise, celery salt, mustard, and food coloring. Spoon this filling into the egg whites and place them on a serving tray. Round the top of the filling using the spoon. Place an olive slice on each yolk to create the center of the eye. Dab a tiny bit of mayonnaise in the center of the olive as a finishing touch.
Preheat oven to 425 degrees F.
Combine 2 cups flour, undissolved yeast, sugar and salt in a large bowl. Add very warm water and oil; mix until well blended, about 1 minute.
Gradually add enough remaining flour to make a soft dough. Dough should form a ball and will be slightly sticky. Knead** on a floured surface, adding additional flour if necessary, until smooth and elastic, about 4 minutes. Divide dough into 8 portions; cover. (If using RapidRise Yeast, let dough rise at this point for 10 minutes.)
Pat each portion of dough with floured hands into an 8-inch circle on a greased baking sheet. Form a rim by pinching the edge of the dough. Add a second crust to the same baking sheet.
Bake for 6 to 7 minutes, dough will be just set and only lightly browned on the bottom. Remove crusts to a wire rack to cool. Continue with remaining pizza dough. (Works best to use several baking sheets.) May use crusts immediately or place in freezer bags and freeze for up to 1 month.
When ready to bake, preheat oven to 475 degrees F. Spread each crust with pizza sauce. Top with desired toppings to make Halloween designs! Repeat with remaining pizzas. Place on a baking sheet and bake for 6 to 8 minutes, until cheese is melted and lightly browned and bottom of crust is browned.