Make crisped rice cereal treats. Prepare crisped rice cereal mixture following recipe directions, on parchment-covered cake board. Let cool, about 20 to 30 minutes. Break apart into 1/2 in. pieces. Set aside.

Prepare candy. Preheat oven to 170°F or low/warm setting. Place about six Candy Melts candy wafers each of blue, orange, dark green, pink, red and yellow, flat side down, on pan. Soften candy wafers in oven, about 6 minutes, to form dots.

Make candy bark. Melt white Candy Melts candy according to package directions. Pour melted white candy over dots. Use spatula to spread evenly. Immediately sprinkle candy with pieces of crisped rice cereal treats; press cereal treat pieces slightly into candy without touching bottom of pan. Chill until firm, about 15 to 20 minutes. Unmold.