Line a cookie sheet with wax paper.
Run a knife through the Oreos, crushing them into small-ish pieces and "dust."
Add milk chocolate chips to a microwave safe bowl and heat in 30 second increments, stirring after each round, until the chocolate is melted and smooth.
Pour onto prepared cookie sheet and spread flat with a spoon. Sprinkle with chopped Oreos.
Add white chocolate chips to a microwave safe bowl and heat in 30 second increments, stirring after each round, until melted and smooth.
Pour over the crushed Oreos and chocolate. Spread to the edges of the milk chocolate layer.
Sprinkle with chopped candy canepieces.
Chill until set, about 2 hours.
Break into pieces and serve. (My bark was pretty thick, so I needed a knife to help with the first break. Once I had the first knife-break, then I was able to break it into smaller pieces with my hands.)
Or package in gift bags or gift tins and send as gifts.