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Drizzle additional melted chocolate on top. Use the rainbow sprinkles on the cake balls. Chill the cake balls again. Finished.
You can create even zig-zag lines by moving your arm back and forth in a uniform way across the entire sheet of cake balls. To decorate the cake pops, you can either sprinkle by hand or dip them in the sprinkles while the chocolate is still in a liquid state, if you're not drizzling chocolate on top. To ensure a hard coating and for any topping to appear more uniform, place the cake balls in the freezer or refrigerator for about an hour or two. Now enjoy and serve your yummy cake pops!