Seems like a great idea for people who gain their entertainment by staring at their digestive products. Of course, there's always the current TV programs for a mild variation.

Scatology has not been a very successful past time but perhaps if you made the pills some sort of supplement that provided nutritional benefits you might find an accepting market. Perhaps you could even add certain deodorizers that would add another benefit to your idea.

Conceivably, if a successful colorant process is developed, the product could have commercial value as a pigment thereby giving value to a normally discarded material. To carry the research beyond deodorization into pleasant odors, it may be possible to create perfumes so that a careless release of body gases in an elevator would induce grateful responses and people would become valuable for their emissions . Perhaps particular artists would be able to create paintings using their body production for a unique effect. Genetic manipulation might be possible to make the stuff glow in the dark so it could be used to paint dividing lines on highways. This is an area that has been severely neglected and requires entreprenural interest. If mice and cockroaches could be induced to produce a glowing product they could easily be traced to their lairs and thereby eliminated.All sorts of possibilities need exploration.

Well I for one have found that blue kool-aid has a nice neon green effect.

Eat beetroot for red sprinkled with paprikaSpinach for green right from AfricaCorn for yellow preferably not grilledGrape for purple, seedless and chilledEarly morning for yellow, before sunriceLate night for brown, after a lunch of cooked riceGarlic, onion, and cheese to give a little flavorNo eggs please, to do your friends a favor