In a large pot, melt the butter over low heat.
Add the marshmallows and stir until completely melted.
Stir in Kool-Aid until well mixed.
Optionally, stir in enough food coloring to make the marshmallows pink.
Remove from heat.
Add the Rice Crispies cereal and stir until cereal is well coated.
Using butter or cooking spray, prepare a 9 x 9 pan.
Butter a your hands or use wax paper to press the mixture firmly into the pan.
Allow to cool.
Cut into bars.
Heat pink candy chips in a small bowl microwaving for 30 seconds at a time.
Stir and repeat until the chips are melted. Allow to cool for 2-3 minutes.
Transfer chocolate to small plastic bag and snip off a tiny piece of the corner.
Pipe diagonal lines on each bar.
Repeat process with white candy chips.