In a medium saucepan, melt the butter over low heat.
Add the marshmallows and mix until completely melted.
Remove the pan from the heat and pour in the rice cereal. Stir until the Rice Krispies are completely coated.
Transfer the mixture to a greased baking dish. Press it down with a spatula.
While still slightly warm, sprinkle the red, white, and blue sprinkles on top. Gently press them in.
Let the mixture cool completely. Cut out the treats with a star-shaped cookie cutter.
Melt the candy melts and white chocolate in the microwave.
Drizzle all three colors over the stars. You can cut a hole in the corner of a sandwich bag for drizzling.