In a blender or food processor, blend all the oreos until you have fine oreo crumbs. 

Transfer the crumbs to a mixing bowl, add in the softened cream cheese and mix with an electric mixer until well combined. The mixture will stick together when it’s all combined and be thick. 

Line a cookie sheet with silicone baking mat. Form tombstone like shapes with the oreo mixture - using about 2-3 tablespoon per ball. Once all the tombstones are formed, place the cookie sheet in the fridge to chill for 20 minutes.

Meanwhile, remove a little less than 1/4 cup of the white candy melts for later for the RIP letters - set aside. Melt the remaining white candy melts along with 1 tablespoon of vegetable oil and melt until smooth. You can do this on the stove top on low heat or in the microwave, melting them on 50% power, stirring them every 30 seconds until melted. Once melted add in a small amount of black food coloring. Stir until you have your desired gray color. 

Remove the oreo balls from the fridge. Place one tombstone in the melted chocolate at a time, coating it as needed, remove from the chocolate with a fork, tapping the excess chocolate off. Use a toothpick to scoot the tombstone off the fork and return to the silicone lined baking sheet. Repeat until all the tombstones have been dipped. Allow them to harden at room temperature. 

Once the gray chocolate is set, melt the remaining white candy melts with 1/2 tbsp vegetable oil. Transfer the chocolate to a squeeze bottle and add RIP to each tombstone. Add other decorative details as desired. Allow the chocolate to set completely.

To assemble the graveyard, fill a pan with chocolate chips or decorative black rocks (I got mine at Michaels). Move the chips around to help get the tombstones in place. Sprinkle skeleton bone sprinkles over the graveyard. If serving later, keep the tombstones in the fridge until serving.