Pour the chilled green fruit punch and purple grape juice into the large punch bowl, allowing the vibrant colors to mix naturally.
Slowly add the cold lemon-lime soda into the bowl, watching as it bubbles up and creates a fizzy, lively effect.
If you want to deepen the colors, stir in a few drops of black food coloring, blending gently until the hues become more intense and striking.
Garnish the punch with slices of citrus fruits, arranging them around the edges to add visual appeal and fresh aroma.
Just before serving, sprinkle pop rocks candies over the surface of the punch for a crackling, bubbly surprise with each sip.
Serve immediately with a ladle, allowing guests to enjoy the colorful, fizzy chaos of this fun Halloween punch.