Lightly spray an 8 or 9 inch round cake pan with nonstick cooking spray, or grease it well with extra butter.

In a large microwave safe bowl, make the yellow layer: combine 2 1/2 cups marshmallows, 2 tablespoons butter, and a big pinch of salt. Microwave on high for 30 seconds, then stir until smooth. If needed, microwave for another 15 seconds. Blend in the yellow food coloring, then fold in the crisp rice cereal.

Use greased or damp hands to press the yellow mixture against the sides of the pan, forming a ring, with the center empty.

In the same bowl, make the orange layer with the next set of ingredients: microwave the marshmallows, butter and salt until melted; add the yellow and red food colorings and the specified crisp rice cereal. Press this orange mixture into a ring just inside the yellow layer, leaving the middle open.

Using a clean bowl, make the white layer by melting the remaining marshmallows, butter, and salt, then folding in the remaining cereal. Press the white layer into the center of the pan.

Let the treats cool completely, at least 2 hours, before slicing into 8 triangular wedges.