Prepare a flat surface with wax paper. In separate bowls, melt each of the colors according to package directions. For instance, for me this meant melting in the microwave in 30 second increments, stirring between each increment until completely melted.

Beginning with one color of chocolate, spread all but a couple of tablespoons over the wax paper in a thin layer, making about a 9 x 13 inch rectangle. Repeat this process with all colors until all three layers have been spread and layered on each other.

Using the remaining tablespoons of each chocolate, spoon lines of the chocolate on the bark. Using a toothpick, drag the dollops through the top layer to make a marbled design.

Top the bark with sprinkles. Let set until completely hardened (or place in the fridge) then cut into pieces with knife or use a towel and a hammer to break apart.