Using a double boiler or microwave, melt the dark chocolate. Once it is melted, pour onto a parchment lined baking sheet in a rectangular shape.
While the dark chocolate is cooling slightly, melt the white chocolate. Once the white chocolate is melted, pour onto the dark chocolate in ribbon-like strands. Use a chopstick to swirl the two chocolates together.
Starting with the chocolate bunnies, place them on the chocolate. Add the chocolate eggs, m&m's and then the sprinkles.
Allow to cool completely and then cut into rectangles or squares.
Store unused chocolate bark in an air-tight container at room temperature.