Place dates, peanut butter, vanilla, oats, sunflower and pumpkin seeds, cocoa and chocolate chips together in a food processor and blend until finely chopped.
Using a tablespoon as a measure, roll mixture into 16 balls and set aside until required.
For the decorations, cut liquorice into 16 x 5cm long pieces and using a sharp knife cut each piece into 8 legs.
Push 4 liquorice legs into each side of energy ball and press 2 halved tic tacs on the front for eyes. Repeat process with remaining balls.
Serve spider energy balls on a plate covered in Persian fairy floss.