To color the eggs, you can use a commercial coloring set, or make your own coloring dip. For each color, combine 1 ½ cups boiling water and 1 teaspoon white distilled vinegar in a large glass. Tint the liquid as desired with food coloring gel (which has deeper colors than liquid coloring, although you can use liquid). Dip each egg in the coloring mixture, and let stand for at least 2 minutes, or until the desired color is reached. Remove the egg from the coloring mixture and let dry on a wire cooling rack set over a baking sheet.