Melt chocolate in the microwave in 30 second intervals.
Divide into three different bowls. Use the candy coloring to color chocolate to desired colors.
Fill skull candy molds (about half way) with colored chocolate and use an offset spatula to remove any extra chocolate. Tap the trap on the counter to avoid air bubbles.
Place in the fridge until harden.
Once your skulls are ready, reheat your chocolate. Dip one side of the Oreo into the chocolate.
Immediately pace chocolate skull in the middle and add sprinkles. Set aside to dry.