Gently separate the oreos by slowly twisting them apart. (Some will break, it's okay, just try to be gentle)
Separate the blue candy melts into 3 parts (this is to keep it from getting hard while you decorate) and place each section in a microwave safe bowl.
To make the chocolate easier to work with about 1/2 teaspoon vegetable oil to each section of chocolate (you can add more later if needed to thin it even more).
Melt in 20 second bursts in the microwave (Microwave 20 seconds, stir 20 seconds, etc.)
Be patient when melting and stir well in between bursts to avoid burning the chocolate.
Dip one end of the lollipop stick into the melted chocolate and press that side into the cream side of the oreo.
Place the other half of the oreo on top and gently press and hold.
Place the oreo on top of a fork over the bowl of melted chocolate. Use a spoon to spoon chocolate over the oreo.
Shake the fork gently on the edge of the bowl until the chocolate forms an even layer.
Set aside and allow to completely harden.
Once hard, melt 1/3rd of the dark green chocolate. Add a little oil if needed to thin.
Transfer the melted green chocolate into a plastic bag and snip off the very tip with scissors.
Pipe the outline of the Christmas tree (see video tutorial) and then sprinkle the Christmas sprinkles on top.
Allow to harden at room temperature.