Chill your martini glass in the fridge or with ice water.
Drizzle chocolate syrup inside the glass in a spiral pattern.
Using a toothpick or skewer, drag lines outward from the center to form a spiderweb.
In a shaker, combine gin, vodka, lemon juice, chocolate liqueur, simple syrup, and ice.
Shake well (about 15 seconds), then strain into the decorated martini glass.
Lightly shake or whisk cream in a small bowl until frothy, then gently float it on top by pouring it over a bar spoon.
Fill a syringe with colored/flavored syrup, then place it into the drink.
Serve immediately while cold and beautiful!