Prepare candies for candles. Use scissors to cut 10 pieces of licorice, 1 1/4 in. long. On parchment-covered surface, use fondant roller with purple guide rings to roll out spice drops, 1/8 in. thick. Use scissors to cut flame shapes, about 1/4 in. long. Set aside.

Make bottom layer of candy bark. Melt bright pink Candy Melts candy according to package directions. Pour melted candy into pan. Use spatula to spread evenly. Chill until firm, about 10 to 15 minutes.

Make top layer of candy bark. Melt birthday cake Candy Melts candy according to package directions. Pour melted birthday cake candy on top of pink layer. Use spatula to spread evenly. Immediately position licorice twists and spice drop flames for candles; press slightly into candy. Press marshmallows into candy; sprinkle with rainbow jimmies. Chill until firm, about 15 to 20 minutes. Unmold. Use knife to cut into pieces for serving.