Line a rimmed baking sheet with parchment paper.
Place the chocolate in a microwave-safe bowl and melt it in the microwave in 10-second intervals, stirring often, until smooth. Add the vanilla and stir well. Gently stir in half the various candy, cookies, pretzels, marshmallows, or what have you.
Using a rubber spatula, spread the chocolate mixture evenly into the prepared baking sheet and smooth the surface as best you can. Sprinkle with the remaining candy, cookies, pretzels, or marshmallows. Loosely cover and refrigerate until the chocolate is set, 2 to 4 hours.
Break the chilled bark into pieces. Indulge or package it up and gift it to anyone and everyone to get it the heck out of your house. (You can store the bark in an airtight container, stacking the layers of bark between sheets of parchment or wax paper, at room temperature for up to 1 week. But we don't think it will last that long.)