Line 2 baking trays with greaseproof or baking paper. Place 5 of the lolly sticks equally spread out on each baking tray.
Break the chocolate into pieces and place each type of chocolate in a separate microwave safe bowl.
Melt each bowl of chocolate in the microwave at 30 second intervals, stirring in between, until just melted and smooth.
Spoon the chocolates into disposable piping bags or small plastic freezer bags.
Snip the corner off the bag of milk chocolate, then pipe a random squiggly pattern over one of the lolly sticks. Repeat with the remaining 4 sticks on that tray or until all the mixture has been used up.
Working quickly, push an assortment of large and small candy eyeballs into each lolly to turn them into monsters.
Repeat with the white chocolate until you have 10 monster lollies.
Once finished, place the trays of monster lollies in the fridge to harden and set – about 15 to 20 minutes should be enough.
Remove from the fridge and store in a cool dry place until ready to serve.