I always wondered how they got the individual rice krispies colored differently, and so I put a cup of of them in a zip lock baggie and put in some red and yellow liquid food coloring and shook to coat them all, then took another cup and did the same with liquid black food coloring. Then I let them dry overnight.
Then today I made the Rice Krispie Treats as usual, (although I doubled it): ten cups Rice Krispies, two bags of the forty count big marshmallows, and six tablespoons of butter. When the butter/marshmallow mix was all melted, I added the undyed Rice Krispies first, then the dyed ones. I thought if I added the dyed ones first to the hot marshmallow mix it might turn the marshmallow mix an unsavory color.
Also, the orange and black dyed Rice Krispies were stale tasting, but after mixing them with the regular ones it all tastes just fine and I couldn't notice any staleness.
So here is the end result:
I would imagine they would look more colorful if the same amount of colored Krispies were used (2 cups) and the recipe was not doubled. I'll try that next time, hoping that the staleness of the colored Krispies will not affect a single batch.