Combine the melted white chocolate and food colouring. Mix well.
Take a baking sheet. Cover it with parchment paper.
Take 1 Oreo Cookie. Insert a wooden popstick in the centre, into the cookie filling.
Dip the Oreo Cookies, one at a time, into the coloured chocolate mixture. Turn them around so that both sides are evenly coated with melted chocolate. Gently shake it to remove the excess chocolate.
Place the cookies on the prepared baking sheet to resemble Christmas trees. Add the holiday sprinkles.
Use a spoon to transfer the melted Cadbury Dairy Milk Silk into a resealable plastic bag. Make a hole in a corner at the bottom of the bag to use as a piping bag.
Pipe chocolate lines on the tree so that they resemble the Christmas light wires.
Use Cadbury Gems to make the lights.
Refrigerate for 30 minutes or until the coating is firm.